Carrier 58MVP - Manual (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 thermostat to OFF position. Turn power back on and wait a few sec for self
test before proceeding to next step.
— — 2
2. Does Fault Code 14 flash? 3 6 —
3. There is a miswire or short to gas valve wiring. — — 4
4. Fix problem. — — 5
5. Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS. — — INDEX
6. Does a different fault occur? 7 8 —
7. Go to page number indicated in Index for the fault code flashed. — — INDEX
8. Remove blower access panel and depress door switch. Use a piece of tape to hold switch closed. — — 9
9. Jumper R and W/W1 thermostat terminals. — — 10
10. Does Fault Code 14 start flashing when low-pressure switch LPS makes? 11 12 —
11. Replace furnace control board. — — 5
12. Does a different fault occur? 7 13 —
13. Disconnect jumper wire across R, and W/W1, 2 thermostat terminals and wait until blower stops.. — — 14
14. Jumper R, W/W1, and W2 thermostat terminals on furnace control board. — — 15
15. Does Fault Code 14 start flashing when high-pressure switch HPS makes? 16 17 —
16. The BLUE and GREEN wires to gas valve GV are reversed. — — 4
17. Disconnect jumper wire across R, W/W1, and W2 thermostat terminals and wait until inducer stops. — — 18
18. Put setup switch SW-1 in ON position. — — 19
19.
Is a Fault Code 34 present in fault history?
NOTE: Read fault codes until they repeat. The last fault code that occurred will flash first fol-
lowed by the lowest number fault code. (EXAMPLE: 14, 14, 34)
20 22 —
20. Cycle furnace several times to check for intermittent operation. — — 21
21.
Check that the GREEN wire is properly connected to furnace sheet metal and clean flame sensor
withfine sandpaper.
— — 5
22.
Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS. If problem
persists on an intermittent basis, replace furnace control board. If problem still persists on an inter-
mittent basis after replacing furnace control board, contact your distributor.
— — INDEX
Fault Code 21
INVALID MODEL SELECTION—Personality connector PL5 is either not connected or jumpered wrong.
STEP ACTION YES NO GO TO
1. Turn power off and remove blower access panel. — — 2
2. Is personality connector PL5 properly wired per furnace model size chart on wiring diagram? 5 3 —
3. Replace or rewire personality connector. — — 4
4. Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS. — — INDEX
5. Depress door switch. Use a piece of tape to hold switch closed. — — 6
6. Make sure thermostat is calling for heat or jumper R and W/W1 thermostat terminals. — — 7
7. Will furnace operate while flashing fault code? 9 8 —
8. Replace furnace control board. — — 4
9. Are personality plug wires making good connection? 10 11 —
10.
The furnace will operate acceptably; however, a model selection circuit failure has occurred and fur-
nace control board is defaulting to last valid model selection. Board replacement is recommended
but not necessary. This fault code will flash continuously.
— — 4
11. Fix poor terminal connection or replace personality connector. — — 4
17