Carrier 58MVP User Manual

58MVPVariable-Speed 2-StageElectronic Condensing FurnaceTroubleshooting GuideNOTE: Read the entire instruction manual before starting theinstallation.

NOT ENOUGH COOLING AIRFLOW—Generally, this indicates the Y/Y2 thermostat lead is not properlyconnected.STEP ACTION YES NO GO TO1.Remove blower access

HIGH-FIRE TEMPERATURE TOO LOW—Generally, this indicates the HIGH/LOW solenoid in gas valve GV hasfailed or furnace is extremely underfired.STEP ACTION

28. Put setup switch SW-1 back in OFF position. — — 2929. Jumper R and W/W1 thermostat terminals. — — 3030. Does RED LED2 turn back ON? 731 —31. Insta

Fault Code 11NO FAULT IN RECENT HISTORY DISPLAY—This indicates 1 of the following:• No faults have occurred in the last 5 previous cycles and setup sw

19.You have an open wire or bad terminal on either the ORANGE or VIOLET wire between connectorsPL13 and PL3. Repair it or replace blower harness(es).—

Wait at least 5 minutes after disconnecting line voltage fromequipment before opening blower motor to prevent electricshock which can cause personal i

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. —

Fault Code 14IGNITION 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 Code 22SETUP ERROR—This fault indicates that setup switches SW-1 or SW-6 are ON when they should be OFF. Thefollowing combinations will cause th

Fault Code 24SECONDARY VOLTAGE FUSE IS OPEN—Indicates fuse is open and there is a short in low-voltage wiring.STEP ACTION YES NO GO TO1. Turn power of

Step 1—Self-Test ModeThe control center goes through a brief self test whenever 115-v or24-v power is interrupted. The self test takes approximately 2

18.Do you have continuity between the N.O. (Normally Open) contact on low-pressure switch LPS andchassis ground?19 3 —19. The ORANGE wire from low-pre

Fault Code 31HIGH-PRESSURE SWITCH FAULT—This fault can occur under the scenarios shown below, keep in mind thatwhenever furnace control board shuts un

25.Connect 1 side of a slope manometer with a tee to collector box pressure tap. Connect other sidewith a tee to gas valve air pressure fitting. Refer

Fault Code 32LOW-PRESSURE SWITCH FAULT—This fault can occur under the scenarios shown below. Keep in mind thatwhenever the furnace control board shuts

29. Is inducer blower wheel okay? 31 30 —30. If possible, replace inducer blower wheel. Otherwise, replace inducer motor assembly. — — 1031. Is there

9. Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS. — — INDEX10.Consider this fault like a Fault Code 13 and go to page num

Fault Code 34IGNITION PROVING FAULT—This fault can indicate 1 of the following:• Flame was not sensed during trial for ignition period. The control wi

41. Make sure perforated disks are in combustion-air vent inlet. — — 4242. Check pressure tubing going to gas valve air pressure fitting for kinks. —

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

Fault Code 42INDUCER OUTSIDE VALID SPEED RANGE—This fault indicates that inducer motor is not operating atcalculated RPM or has not started within 10

In emergency heat mode, the normal heat mode outlined inHeating Mode section is not followed. The following sequencewill occur:When thermostat calls f

43. If possible, replace inducer wheel. Otherwise, replace inducer motor assembly. — — 844. Is there any frost build-up on combustion-air inlet? 45 46

4. Observe operation of furnace for several minutes or until fault occurs. — — 55. Does fault occur again? 96 —6. Does a different fault occur? 78 —7.

Fault Code 44BLOWER CALIBRATION FAULT-This fault indicates that calculated blower motor speed is below 250 or above1300 RPM. When Fault Code 44 occurs

CLEANUP AND START-UP INSTRUCTIONS1. Start furnace using procedure outlined on Lighting Instruc-tions attached to furnace. Observe operation of furnace

Appendix ABoard Layout and SchematicW2COM24VW/W2 Y/Y2RGHUMHOTSURFACE IGNITORCONNECTOREAC-ELECTRONICAIR CLEANERTERMINALS(115-VAC 1 AMP MAX)115-

Wiring SchematicA98305FRS LS ALSFSEGVCMPHINOTE #33PL1PL712104 612ORNBRNYELGRNBLKWHT3PL9HSI121.5 AMPEAC1EAC221PL412378456YELORNBRNGRNBLUBRNRED10 11B2RE

Appendix BIsolation CircuitsTHERMOSTATFURNACECONTROLBOARDK1K1K2K2OUTDOORUNITK1K2FIELD-SUPPLIED24-VAC SPST RELAYSRWYGCRY/Y2W/W1GComYCA95097Fig. 5—

Appendix DQuick Motor Test ProcedureIn an effort to provide a method of troubleshooting inducer and blower motor by themselves, the following procedur

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?

Wait at least 5 minutes after disconnecting line voltage fromequipment before opening blower motor to prevent electricshock which can cause personal i

b. R-W/W1 with R-Y/Y2 and R-G signals terminated—The blower continues to operate completing a normalblower off delay.11. Post purge—The inducer contin

Appendix EVariable-Speed Condensing Furnace Duct Static and BlowerOperationThis variable-speed furnace has an Integrated Control and Motor called an I

A973200.80.70.60.50.40.3LOWHEATHIGHHEATConstant SystemCurvesExternal Static Pressure (in. wc)2 Ton 3 Ton 31⁄2 Ton21⁄2 Ton0.20.10500 600 700 800 900 10

Downflow Total Static Pressure Reading LocationsA95091Closet — Downflow ApplicationELECTRONICAIR CLEANERHUMIDIFIERA/C COILVENTCOMBUSTIONAIROUTDOORU

Tools Needed:1) Pitot Tube1) Incline Manometer/MagnahelicBoth examples are correct. Example 1 ESP readings were taken aslaid out in Static Pressure Re

Duct Static Check SheetFurnace:Model NumberSerial NumberPosition? U/F D/F H/R H/LIndoor Coil:Model NumberSerial NumberOutdoor Unit:Model NumberSerial

Appendix FQuick Reference InformationPRESSURE SWITCH MAKE/BREAK POINTSUNIT SIZE (BTUH)HIGH-PRESSURE SWITCH LOW-PRESSURE SWITCHMake Point Break Point M

Appendix GThermostat Staging Algorithm• Unit Default: Algorithm is initiated with Low Heat for 16 minutes. If call for heat still exists, unit transfe

A95094VARIABLE SPEED CONDENSING FURNACE ALGORITHMUsing recorded Low Heat (LH)and High Heat (HH) values,calculate the Heat Load (HL)using:HL=(228 X LH)

A94328SERVICE TRAININGPackaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, in

When items 1-5 have been completed, the following will occur:1. The control center goes through a brief self test. This self testtakes approximately 2

START HERE—If a problem exists, the service technician should always begin troubleshooting here.STEP ACTION YES NO GO TO1.Remove furnace door first. D

A99243aEACH OF THE FOLLOWING STATUS CODES IS A TWO DIGIT NUMBER WITH THE FIRST DIGITDETERMINED BY NUMBER OF FLASHES OF THE YELLOW LED AND THE SECOND D

→Fig. 4—Service Label/Fault Code InstructionsA99243bA99243To initiate the component test sequence, shut "OFF" the room thermostat or disconn

IMPROPER OPERATION WITH NO FLASHING FAULT CODE—Generally, this indicates there is no power tofurnace control board.STEP ACTION YES NO GO TO1. Make sur