TROUBLESHOOTING
8-5
TABLE 8-1. BOILER TROUBLESHOOTING – Continued
FAULT INDICATION PROBABLE CAUSES TROUBLESHOOTING/CORRECTIVE ACTION
(continued) 8. Defective staged ignition solenoid
valve.
9. Clogged staged ignition piece.
10. Carbon or other debris on burner
8. When boiler goes to ignition, listen to solenoid valve to ensure it
is opening.
9. Remove and inspect staged ignition piece for blockage.
Remove the burner and inspect for any carbon or debris. Clean
and reinstall
FLAME LOSS
DURING RUN
1. Worn Flame Detector or cracked
ceramic.
2. Poor combustion calibration.
3. Debris on burner.
4. Blocked condensate drain.
1. Remove and inspect the Flame Detector for signs of wear or
cracked ceramic. Replace if necessary.
2. Check combustion calibration. Adjust as necessary.
3. Remove the burner and inspect for any carbon or debris. Clean
and reinstall.
4. Remove blockage in condensate drain.
HEAT DEMAND
FAILURE
1. The Heat Demand Relays on the
Ignition/Stepper board failed to
activate when commanded
2. Relay is activated when not in
Demand
1. Press CLEAR button and restart the unit. If the fault persists,
replace Ignition/Stepper (IGST) Board.
2. Defective relay. Replace IGST Board.
HIGH GAS
PRESSURE
1. Incorrect supply gas pressure.
2. Defective gas pressure adjustment
in SSOV Actuator.
1. Check to ensure gas pressure at inlet of SSOV is 2 psig
maximum.
2. If gas supply pressure downstream of SSOV cannot be lowered,
to 2.8” W.C. (or 2.3" W.C. for propane), the SSOV Actuator gas
pressure adjustment mechanism may be defective. [see para.
4.3, step 10 (natural gas), or 4.4, step 10 (propane)],
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