PeerlessBoilers PF-50 Installation, Operation & Maintenance Manual page 49

Table 10.2 (cont'd): Control Board Blocking Error Codes (manual reset):
"E"
Error Display
CODE
FALSE FLAME DETECTED
A19
AFTER SHUTDOWN
FALSE FLAME DETECTED
A20
BEFORE IGNITION
A23 FLOW_SW_NOT_OPEN
A24 FLOW_SW_NOT_CLOSED
A32 FAN NOT RUNNING
Internal
Error Description
No.
Flame signal detected 10 sec.
20
after closing the gas valve.
Flame signal detected before gas
21
valve opened.
25 CH flow switch not working.
26 CH flow switch not working.
23 Internal Software Error.
TROUBLESHOOTING
Corrective Action
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.
4. Check flame sensor to be sure there is no short to
ground.
Check igniter to be sure there is not short to
ground.
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.
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.
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