Fault Code - Carrier 58MVP Troubleshooting Manual

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 successfully completed and setup switch SW-6 is in ON position.
STEP
Remove blower access panel and depress door switch. Use a piece of tape to
1.
hold switch closed.
2. Is setup switch SW-1 in ON position?
3. Put setup switch SW-1 in OFF position.
Go to page number indicated in Index for CLEANUP AND START-UP
4.
INSTRUCTIONS.
5. Is setup switch SW-6 in ON position.
6. Put setup switch SW-6 in OFF position.
Jiggle setup switches SW-1 and SW-6 back and forth. If Fault Code 11 contin-
7.
ues to flash, replace furnace control board.
Fault Code 12
BLOWER CALIBRATION LOCKOUT—This fault indicates that blower motor speed calculated for low heat is
either less than 250 RPM or greater than 1300 RPM on 2 successive attempts at calibration. Control will
auto-reset in 3 hours.
STEP
Turn power off, wait 30 sec, and then restore power. Reset thermostat. Observe
1. operation of furnace through 1 heating cycle.
NOTE: Blower access panel must be in place.
2. Does only Fault Code 44 flash?
The problem is excessive restriction in the air delivery system. Check filters and
3.
ductwork. Use Appendix E to evaluate.
4. Fix problem.
Go to page number indicated in Index for CLEANUP AND START-UP
5.
INSTRUCTIONS.
6. Does Fault Code 44 flash twice followed by Fault Code 41?
7. Does a different fault occur?
8. Go to page number indicated in Index for fault code flashed.
9. Turn power off and remove blower access panel.
Are all pins and wire leads intact on connectors between furnace control board
10.
and blower motor.
Depress door switch. Use a piece of tape to hold switch closed. Wait a few sec
11.
for self test before proceeding to next step.
Disconnect all thermostat leads from furnace control board and jumper R and
12.
W/W1 thermostat terminals.
Does blower motor turn on and come up to speed (400-500 RPM) before fault
13.
code flashes?
Disconnect jumper wire across R and W/W1 thermostat terminals, turn power
14. off, and then restore power. Wait a few sec for self test before proceeding to
next step.
Check RPM feedback line. To do this, connect a DC voltmeter across terminals
PL3-2 ORANGE (+) and PL3-3 VIOLET (-), then put setup switch SW-6 for
COMPONENT TEST in ON position. Does voltage across ORANGE and VIO-
15. LET wires change between states as shown below?
• State 1—OFF (12.0 — 12.5 vdc)
• State 2—LOW (10.7 — 11.7 vdc)
• State 3—HIGH (9.7 — 10.7 vdc)
16. Replace furnace control board.
12
YES NO GO TO
— — 2
3 5 —
— — 4
— — INDEX
6 7 —
— — 4
— — 4
YES NO GO TO
— — 2
40 6 —
— — 4
— — 5
— — INDEX
9 7 —
8 39 —
— — INDEX
— — 10
11 4 —
— — 12
— — 13
14 20 —
— — 15
16 17 —
— — 5