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Carrier 58MVP - page 1
58MVP Variable-Speed 2-Stage Electronic Condensing Furnace Troubleshooting Guide NOTE: Read the entire instruction manual before starting the installation. SAFETY CONSIDERATIONS INDEX PAGE Instructions .....................................................................................1 Example ..................................................... ...
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Carrier 58MVP - page 2
Step 1—Self-Test Mode The control center goes through a brief self test whenever 115-v or 24-v power is interrupted. The self test takes approximately 2 sec to complete. After power is restored, red (microprocessor) LED briefly comes on. Then green LED comes on for 1 sec, followed by 1 sec where both yellow and green LEDs are on. During this time ...
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Carrier 58MVP - page 3
In emergency heat mode, the normal heat mode outlined in Heating Mode section is not followed. The following sequence will occur: When thermostat calls for heat, the R-W/W-1 circuits close. 1. Prepurge period —The inducer motor is turned on IMMEDI- ATELY operating at maximum speed, closing low- and high-pressure switches. Prepurge begins 25 sec a ...
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Carrier 58MVP - page 4
b. R-W/W1 with R-Y/Y2 and R-G signals terminated — The blower continues to operate completing a normal blower off delay. 11. Post purge —The inducer continues operating for 15 sec after gas valve is de-energized. Step 7—Continuous Fan Mode 1. Operating with continuous fan only . a. Call for continuous fan —The thermostat closes R-G circuit. ...
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Carrier 58MVP - page 5
When items 1-5 have been completed, the following will occur: 1. The control center goes through a brief self test. This self test takes approximately 2 sec to complete. After door switch is closed, red (microprocessor) LED briefly comes on. Then green LED comes on for 1 sec, followed by 1 sec where both green and yellow LEDs are on. During this ti ...
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Carrier 58MVP - page 6
START HERE—If a problem exists, the service technician should always begin troubleshooting here. STEP ACTION YES NO GO TO 1. Remove furnace door first. DO NOT REMOVE BLOWER ACCESS PANEL! Record status of LED’s 1-4. See Service Label/Fault Code Instructions (Fig.4). —— 2 2. Are any LEDs flashing? 53 — 3. Are any LEDs on solid? (Solid means ...
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Carrier 58MVP - page 7
A99243a EA CH OF THE FOLLOWING ST A TUS CODES I S A TWO DIGIT NUMBER W I TH THE FIRST DI GIT DETERMINED BY NUMBER O F FLASHES OF T HE YEL LOW LED AND THE SECOND DIGIT DETERMINED BY NUMBER O F FLASHES OF T HE GREEN LED . F ur n a c e i s oper ati ng i n emer ge nc y h ea t . The m icr oprocesso r has malf uncti on ed. T o r eset: Pu t set up sw i tc ...
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Carrier 58MVP - page 8
→ Fig. 4—Service Label/Fault Code Instructions A99243b A99243 T o i n i ti a te the co mpo n en t t es t s equ en ce , shu t " O FF" th e ro om th er mos ta t o r d i sc on ne ct t he " R" ther mosta t l ead. Pu t se tup swi tch "SW -6" in th e "ON" po siti on to st art the comp one nt tes t seq u e n c e ...
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Carrier 58MVP - page 9
IMPROPER OPERATION WITH NO FLASHING FAULT CODE—Generally, this indicates there is no power to furnace control board. STEP ACTION YES NO GO TO 1. Make sure power is on. —— 2 2. Remove blower access panel and depress door switch. Use a piece of tape to hold switch closed. Wait a few sec for self test before proceeding to next step. —— 3 3. ...
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Carrier 58MVP - page 10
NOT ENOUGH COOLING AIRFLOW—Generally, this indicates the Y/Y2 thermostat lead is not properly connected. STEP ACTION YES NO GO TO 1. Remove blower access panel and depress door switch. Use a piece of tape to hold switch closed. Wait a few sec for self test before proceeding to next step. —— 2 2. Make sure thermostat is calling for cooling. If ...
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Carrier 58MVP - page 11
HIGH-FIRE TEMPERATURE TOO LOW—Generally, this indicates the HIGH/LOW solenoid in gas valve GV has failed or furnace is extremely underfired. STEP ACTION YES NO GO TO 1. Turn power off and remove blower access panel. Make sure thermostat is NOT calling for heat. — — 2 2. Depress door switch. Use a piece of tape to hold switch closed. Wait a fe ...
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Carrier 58MVP - page 12
28. Put setup switch SW-1 back in OFF position. — — 29 29. Jumper R and W/W1 thermostat terminals. — — 30 30. Does RED LED2 turn back ON? 73 1 — 31. Install isolation relays in the W/W1 and Y/Y2 circuits per Fig. 5 in Appendix B or replace thermostat. — — 8 32. Was RED LED2 ON before you started Step 1? 34 33 — 33. Solid YELLOW LED3 ...
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Carrier 58MVP - page 13
Fault Code 11 NO FAULT IN RECENT HISTORY DISPLAY—This indicates 1 of the following: • No faults have occurred in the last 5 previous cycles and setup switch SW-1 is in ON position. • The fault history can be cleared by jumpering R, W/W1, and Y/Y2 thermostat leads simultaneously while setup switch SW-1 is in ON position. • Component test was ...
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Carrier 58MVP - page 14
19. You have an open wire or bad terminal on either the ORANGE or VIOLET wire between connectors PL13 and PL3. Repair it or replace blower harness(es). —— 5 20. Remove tape from door switch and turn power off at main disconnect. — — 21 21. Does blower wheel rub against blower housing? 4 22 — 22. Does blower wheel turn freely? 23. Is blowe ...
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Carrier 58MVP - page 15
Wait at least 5 minutes after disconnecting line voltage from equipment before opening blower motor to prevent electric shock which can cause personal injury or death. → 44. Remove tape from door switch and turn power off at main disconnect. —— 4 5 → 45. Disconnect PL10 from blower assembly. — — 46 → 46. Remove control box assembly fr ...
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Carrier 58MVP - page 16
16. Does the installation have a bypass humidifier? 17 30 — 17. Is setup switch SW-3 in ON position? 19 18 — 18. Put setup switch SW-3 in ON position. — — 9 19. Cycle furnace with blower access panel in place and record temperature rise across furnace 6 min- utes after main burner ignition. —— 2 0 20. Disconnect jumper wire across R and ...
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Carrier 58MVP - page 17
Fault Code 14 IGNITION LOCKOUT—This fault indicates the system failed to ignite gas and prove flame in 4 attempts. Control will auto-reset in 3 hr. This fault could also indicate the gas valve relay GVR on furnace control board is stuck closed or there is a miswire/short to gas valve wiring. STEP ACTION YES NO GO TO 1. Turn power off and set ther ...
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Carrier 58MVP - page 18
Fault Code 22 SETUP ERROR—This fault indicates that setup switches SW-1 or SW-6 are ON when they should be OFF. The following combinations will cause the fault: • Thermostat call with SW-1 ON. • Thermostat call with SW-6 ON. • SW-1 and SW-6 both ON together. STEP ACTION YES NO GO TO 1. Turn power off and remove blower access panel. — — ...
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Carrier 58MVP - page 19
Fault Code 24 SECONDARY VOLTAGE FUSE IS OPEN—Indicates fuse is open and there is a short in low-voltage wiring. STEP ACTION YES NO GO TO 1. Turn power off and remove blower access panel. — — 2 2. Is secondary voltage fuse blown? Check continuity to make sure. 5 3 — 3. Replace furnace control board. —— 4 4. Go to page number indicated in ...
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Carrier 58MVP - page 20
18. Do you have continuity between the N.O. (Normally Open) contact on low-pressure switch LPS and chassis ground? 19 3 — 19. The ORANGE wire from low-pressure switch LPS is shorting to ground. Replace or repair it. — — 9 20. Does Fault Code 24 occur when gas valve GV is energized? 21 28 — 21. Disconnect jumper wire across R and W/W1 thermo ...
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Carrier 58MVP - page 21
Fault Code 31 HIGH-PRESSURE SWITCH FAULT—This fault can occur under the scenarios shown below, keep in mind that whenever furnace control board shuts unit down, gas shuts off immediately, inducer continues running for 15 sec, and if blower is running, it remains running at low-heat speed or reduces to low-heat speed for selected off delay. • CA ...
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Carrier 58MVP - page 22
25. Connect 1 side of a slope manometer with a tee to collector box pressure tap. Connect other side with a tee to gas valve air pressure fitting. Refer to pressure check diagram in Appendix C. —— 2 6 26. Turn power on and wait several sec, then jumper R and W/W1 thermostat terminals on furnace con- trol board. —— 2 7 27. Monitor slope mano ...
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Carrier 58MVP - page 23
Fault Code 32 LOW-PRESSURE SWITCH FAULT—This fault can occur under the scenarios shown below. Keep in mind that whenever the furnace control board shuts unit down, gas shuts off immediately, inducer continues running for 15 sec, and if blower is running it remains running at low-heat speed or reduces to low-heat speed for selected off delay. • ...
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Carrier 58MVP - page 24
29. Is inducer blower wheel okay? 31 30 — 30. If possible, replace inducer blower wheel. Otherwise, replace inducer motor assembly. — — 10 31. Is there any frost build-up on combustion-air inlet? 32 33 — 32. The problem is caused by reversed vent and combustion-air pipes or some other moist air entering combustion-air pipe. —— 2 7 33. Y ...
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Carrier 58MVP - page 25
9. Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS. — — INDEX 10. Consider this fault like a Fault Code 13 and go to page number indicated in Index for Fault Code 13. — — INDEX 11. Do you have 24v between terminals PL1-9 and C? 13 12 — 12. Replace furnace control board. —— 9 13. Do you have 24v between termi ...
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Carrier 58MVP - page 26
Fault Code 34 IGNITION PROVING FAULT—This fault can indicate 1 of the following: • Flame was not sensed during trial for ignition period. The control will repeat ignition sequence 3 more times before going into Fault 14—IGNITION LOCKOUT. • The flame signal was lost after trial for ignition period. • The flame signal was sensed while gas v ...
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Carrier 58MVP - page 27
41. Make sure perforated disks are in combustion-air vent inlet. — — 42 42. Check pressure tubing going to gas valve air pressure fitting for kinks. — — 43 43. Remove gas valve air pressure fitting and check gas valve for blockage. — — 44 44. Ensure vent and combustion-air pipes are not reversed. — — 45 45. Check burner orifice size ...
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Carrier 58MVP - page 28
23. Are ORANGE and VIOLET wires from PL3 and PL13 making good contact? 24 17 — → 24. Replace entire blower motor or blower control module attached to the blower motor. If you replace the blower control module go to step 26. —— 1 7 → 25. Go to page number indicated in Index for CLEANUP AND STARTUP INSTRUCTIONS. If problem persists on an in ...
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Carrier 58MVP - page 29
Fault Code 42 INDUCER OUTSIDE VALID SPEED RANGE—This fault indicates that inducer motor is not operating at calculated RPM or has not started within 10 sec after a call for heat. STEP ACTION YES NO GO TO 1. Turn power off, remove blower access panel, and disconnect all thermostat leads from furnace con- trol board. —— 2 2. Turn power on and d ...
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Carrier 58MVP - page 30
43. If possible, replace inducer wheel. Otherwise, replace inducer motor assembly. — — 8 44. Is there any frost build-up on combustion-air inlet? 45 46 — 45. The problem is caused by reversed vent and combustion-air pipes or some other moist air entering combustion-air pipe. —— 1 4 → 46. You have inadequate combustion-air supply. This m ...
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Carrier 58MVP - page 31
4. Observe operation of furnace for several minutes or until fault occurs. — — 5 5. Does fault occur again? 96 — 6. Does a different fault occur? 78 — 7. Go to page number indicated in Index for fault code flashed. — — INDEX 8. Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS. — — INDEX 9. Is collector box ...
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Carrier 58MVP - page 32
Fault Code 44 BLOWER CALIBRATION FAULT-This fault indicates that calculated blower motor speed is below 250 or above 1300 RPM. When Fault Code 44 occurs in HEATING, COOLING, or CONTINUOUS FAN mode, unit operates as shown below. Keep in mind that whenever furnace control board shuts unit down in heating mode, gas shuts off immediately, inducer conti ...
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Carrier 58MVP - page 33
CLEANUP AND START-UP INSTRUCTIONS 1. Start furnace using procedure outlined on Lighting Instruc- tions attached to furnace. Observe operation of furnace through at least 1 complete heating cycle controlled from room thermostat. Observe each cycle for 20 minutes or until a fault code is flashed. If a fault occurs, refer to the Index. 2. Recycle as n ...
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Carrier 58MVP - page 34
Appendix A Board Layout and Schematic W2 COM 24V W/W2 Y/Y2 RG HUM HOT SURFACE IGNITOR CONNECTOR EAC-ELECTRONIC AIR CLEANER TERMINALS (115-VAC 1 AMP MAX) 115-V CONNECTORS (SEE DETAILS ABOVE) 24-V THERMOSTAT TERMINALS PRESSURE SWITCH CONNECTOR HUM-HUMIDIFIER TERMINAL (24-VAC 0.5 AMP MAX) TRANSFORMER 24-V ...
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Carrier 58MVP - page 35
Wiring Schematic A98305 FRS LS ALS FSE GV C M P HI NOT E #3 3 PL1 PL7 12 1 0 4 6 12 ORN BRN YEL GRN BLK WHT 3 PL 9 HS I 12 1. 5 A MP EAC1 EAC2 2 1 PL4 1 2 3 7 8 4 5 6 YEL ORN BRN GR N BLU BRN RED 10 11 B2 RED 9 5 PL3 5BL U 4YEL 3VIO 2ORN 1RE D RE D ORN VIO YEL BLU WHT BLK RED ORN VIO YEL BLU 98 765432 1 PL10 1 PL 11 5 IND. NOT E #7 PL11 PL12 12543 ...
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Carrier 58MVP - page 36
Appendix B Isolation Circuits THERMOSTAT FURNACE CONTROL BOARD K 1 K 1 K 2 K 2 OUTDOOR UNIT K 1 K 2 FIELD-SUPPLIED 24-VAC SPST RELAYS R W Y G C R Y / Y2 W / W1 G Com Y C A95097 Fig. 5—Isolation of W/W1 and Y/Y2 Thermostat Circuits THERMOSTAT FURNACE CONTROL BOARD K 1 K 1 K 1 –FIELD-SUPPLIED 24-VAC SPST RELAY R W Y ...
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Carrier 58MVP - page 37
Appendix D Quick Motor Test Procedure In an effort to provide a method of troubleshooting inducer and blower motor by themselves, the following procedure may save you some time in the event any of the following fault codes are the reason for service call (12, 32, 41, 42, or 44). If you get any other fault code, you should use main troubleshooting g ...
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Carrier 58MVP - page 38
30. Does blower wheel rub against blower housing? 16 31 — 31. Does blower wheel turn freely? 32 33 — 32. Is blower wheel firmly mounted on motor shaft? 34 16 — → 33. Replace blower motor or blower control module attached to the blower motor. If you replace the blower control module go to step 51. Always inspect failed motor for water damage ...
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Carrier 58MVP - page 39
Wait at least 5 minutes after disconnecting line voltage from equipment before opening blower motor to prevent electric shock which can cause personal injury or death. → 51. Remove tape from door switch and turn power off at main disconnect. — — 52 → 52. Disconnect PL10 from blower assembly. — — 53 → 53. Remove control box assembly fr ...
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Carrier 58MVP - page 40
Appendix E Variable-Speed Condensing Furnace Duct Static and Blower Operation This variable-speed furnace has an Integrated Control and Motor called an ICM. This ICM is controlled as stated in Sequence of Operation section. This furnace does a good job compensating for an improperly sized duct system, but this ICM is not a fix for all bad ductwork. ...
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Carrier 58MVP - page 41
A97320 0.8 0.7 0.6 0.5 0.4 0.3 LOW HEAT HIGH HEAT Constant System Curves External Static Pressure (in. wc) 2 Ton 3 Ton 3 1 ⁄ 2 Ton 2 1 ⁄ 2 Ton 0.2 0.1 0 500 600 700 800 900 1000 1100 CFM 1200 1300 1400 1500 1 1 ⁄ 2 Ton Air Delivery Curve — 080-14 A93074 0.8 0.7 0.6 0.5 0.4 0.3 LOW HEAT HIGH HEAT Constant System Curves External Stat ...
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Carrier 58MVP - page 42
Downflow Total Static Pressure Reading Locations A95091 Closet — Downflow Application ELECTRONIC AIR CLEANER HUMIDIFIER A/C COIL VENT COMBUSTION AIR OUTDOOR UNIT AIRFLOW RETURN STATIC INCLINE MANOMETER SUPPLY STATIC INCLINE MANOMETER Upflow Total Static Pressure Reading Locations A95090 Basement — Upflow Application COMBUSTION AIR P ...
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Carrier 58MVP - page 43
Tools Needed: 1) Pitot Tube 1) Incline Manometer/Magnahelic Both examples are correct. Example 1 ESP readings were taken as laid out in Static Pressure Reading Location Diagrams. Example 2 readings are taken as described. The coil and filter static pressure drops were taken from the manufacturer’s Product Data Sheets with the assumption that we a ...
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Carrier 58MVP - page 44
Duct Static Check Sheet Furnace: Model Number Serial Number Position? U/F D/F H/R H/L Indoor Coil: Model Number Serial Number Outdoor Unit: Model Number Serial Number Thermostat Electronic Air Cleaner What type of media filter is being used? What is static pressure drop across filter? At what CFM? Does fault code go away when you remove filter? Wha ...
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Carrier 58MVP - page 45
Appendix F Quick Reference Information PRESSURE SWITCH MAKE/BREAK POINTS UNIT SIZE (BTUH) HIGH-PRESSURE SWITCH LOW-PRESSURE SWITCH Make Point Break Point Make Point Break Point 40,000 1.81 in. wc max 1.63 in. wc ± 0.05 0.75 in. wc max 0.60 in. wc ± 0.05 60,000 80,000 100,000 120,000 1.81 in. wc max 1.63 in. wc ± 0.05 0.95 in. wc max 0.80 in. wc ...
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Carrier 58MVP - page 46
Appendix G Thermostat Staging Algorithm • Unit Default: Algorithm is initiated with Low Heat for 16 minutes. If call for heat still exists, unit transfers into High Heat until thermostat is satisfied. • Low Heat run time is calculated based on previous heating cycle. • High Heat on time is not calculated. High Heat is energized 1 of 3 ways an ...
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Carrier 58MVP - page 47
A95094 VARIABLE SPEED CONDENSING FURNACE ALGORITHM Using recorded Low Heat (LH) and High Heat (HH) values, calculate the Heat Load (HL) using: HL=(228 X LH) + (350 X HH) Is HL < 3648? Is HL > 5600? Is 5600 > HL > 3648? Calculate Low Heat (LH) on time will be 16 minutes. Calculate Low Heat (LH) on time will be 0 minutes. Unit will initia ...
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Carrier 58MVP - page 48
A94328 SERVICE TRAINING Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including: • Unit Familiarization • Maintenance • Installation Overview • Operating Sequence A large selection of product, theory, and skills programs is availa ...
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