47
TROUBLESHOOTING
“E”
CODE
Error Display
Internal
No.
Error Description Corrective Action
A19
FALSE FLAME DETECTED
AFTER SHUTDOWN
20
Flame signal detected 10 sec.
after closing the gas valve.
1. Check flame sensor to be sure there is no short to
ground.
2. Check igniter to be sure there is not short to
ground.
3. This could also indicate that the gas valve doesn’t
close completely.
A20
FALSE FLAME DETECTED
BEFORE IGNITION
21
Flame signal detected before gas
valve opened.
4. Check flame sensor to be sure there is no short to
ground.
Check igniter to be sure there is not short to
ground.
A23 FLOW_SW_NOT_OPEN 25 CH flow switch not working.
1. Check for electrical continuity between wires
connected to terminals 9 & 10 from field supplied
flow switch.
2. If there is continuity when the circulator is off,
there is a system piping or circulator control
problem.
A24 FLOW_SW_NOT_CLOSED 26 CH flow switch not working.
1. Check for electrical continuity between wires
connected to terminals 9 & 10 from the field
supplied flow switch.
2. If there is no continuity, check to be sure the
circulator is working.
3. If the circulator is working correctly, check the
flow switch.
A32 FAN NOT RUNNING 23 Internal Software Error.
Table 10.2 (cont’d): Control Board Blocking Error Codes (manual reset):
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