Status Code 22 - Abnormal Flame-Proving Signal; Status Code 23 - Pressure Switch Did Not Open - Bryant 355CAV A Series Troubleshooting Manual

STEP
17. Cycle the furnace several times to check for intermittent operation.
18. Does status code 21 ever flash?
19. Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS. If
the problem persists on an intermittent basis, replace the variable speed furnace control. If
problem still persists on an intermittent basis after replacing the variable speed furnace control,
contact your distributor.
Status Code 22
ABNORMAL FLAME-PROVING SIGNAL - This status code indicates the flame signal was sensed while gas valve GV was de-
energized. The inducer will run until the fault is cleared.
STEP
1. Turn off gas to the furnace by shutting off the external manual shut-off valve.
2. Does status code 22 stop flashing?
3. Replace the gas valve.
4. Disconnect wire from the flame-proving sensor electrode FSE.
5. Does status code 22 stop flashing?
6. Clean flame sensor with fine steel wool. Inspect burner box assembly and remove any carbon
deposits near the flame sensor opening.
7. Replace the variable speed furnace control.
8. Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS.
Status Code 23
PRESSURE SWITCH DID NOT OPEN - This status code indicates the low or medium heat pressure switch LPS or MPS is made
when a call for heat is initiated. The variable speed furnace control will flash status code 23 until the switch opens, then cycle
begins.
STEP
1. Turn power off, remove blower access panel, and disconnect User Interface ABCD connector
(if used) or the R thermostat lead (if used) from the furnace control board.
2. Turn power on and depress door switch. Use a piece of tape to hold switch closed.
3. Jumper R and W/W1 thermostat terminals.
4. Does status code 23 flash?
5. Does a different status code flash?
6. Go to page number indicated in the Index for the section covering the status code.
7. Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS.
8. Is the inducer motor ON?
9. Is 24-vac across ORANGE wire on the low heat pressure switch LPS and C
variable speed furnace control?
10. Is 24-vac across connector terminal PL1-4 and C
11. The main harness is miswired.
12. Rewire low heat pressure switch LPS per the wiring diagram.
13. Is 24-vac across VIOLET wire on the medium heat pressure switch MPS and C
variable speed furnace control?
14. Is 24-vac across connector terminal PL1-3 and C
15. Replace variable speed furnace control.
16. Is the low heat pressure switch LPS wired correctly?
17. Replace the pressure switch assembly.
18. Is the medium heat pressure switch MPS wired correctly?
19. Rewire medium heat pressure switch MPS per wiring diagram.
20. Check the inducer PWM line. To do this disconnect PL11 from the inducer motor and connect
a DC voltmeter across terminals PL11-2 BROWN (+) and PL11-10 YELLOW (-) then run
COMPONENT TEST by turning setup switch SW1-6 ON. Does voltage across PL11-2 and
PL11-10 change between states as shown below?
- State 1 – OFF (1.0 – 4.0 vdc)
- State 2 – MED (7.0 – 10.0 vdc)
21. Replace inducer motor or inducer motor assembly.
ACTION
ACTION
ACTION
-24V on variable speed furnace control?
OM
-24V on variable speed furnace control?
OM
- 18 -
YES
11
YES
3
6
YES
8
6
20
-24V on 16
OM
11
-24V on 18
OM
11
17
17
21
NO GO TO
18
19
INDEX
NO GO TO
2
4
8
8
7
8
8
INDEX
NO GO TO
2
3
4
5
7
INDEX
INDEX
9
10
13
7
7
14
15
7
12
7
19
7
15
7