Watts AERCO Benchmark OMM-0136 Operation And Service Manual page 143

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
TABLE 10-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Defective Ignition/Stepper (IGST) Board.
4.
Defective SSOV.
5.
Worn Flame Detector or cracked ceramic.
1.
Defective Regulator.
2.
FLAME LOSS
Poor combustion calibration.
DURING RUN 3.
Debris on burner.
4.
Blocked condensate drain.
5.
The Heat Demand Relays on the
1.
HEAT
Ignition/Stepper (IGST) board failed to activate
DEMAND
when commanded.
FAILURE
Relay is activated when not in Demand.
2.
Poor combustion calibration.
1.
HIGH EXHAUST
TEMPERATURE
Carboned heat exchanger due to incorrect
2.
combustion calibration.
Incorrect supply gas pressure.
1.
HIGH GAS
PRESSURE
OMM-0137_E • GF-211 •
12/13/2019
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Corrective Action
If 120VAC is not present, the IGST Board in the Edge Controller
4.
may be defective. Refer fault to qualified service personnel.
While externally arcing the spark igniter, observe the open/close
5.
indicator in the Safety Shut-Off Valve to ensure it is opening. If the
valve does not open, check for 120VAC at the valve input
terminals. If 120VAC is not present, the IGST board in the Edge
Controller may be defective. Refer fault to qualified service
personnel.
Remove and inspect the Flame Detector for signs of wear or
1.
cracked ceramic. Replace if necessary.
Check gas pressure readings using a gauge or manometer into
2.
and out of the Air/Fuel Valve to ensure that the gas pressure into
and out of the valve is correct.
Check combustion calibration using the procedures in Section 4.4:
3.
Combustion Calibration of this guide.
Remove the burner and inspect for any carbon build-up or debris.
4.
Clean and reinstall.
Remove blockage in condensate drain.
5.
Press CLEAR button and restart the unit. If the fault persists,
1.
replace Ignition/Stepper (IGST) Board.
Defective relay. Replace IGST Board.
2.
Check combustion calibration using procedures in Section 4.4:
1.
Combustion Calibration of this guide.
If exhaust temperature is greater than 200
2.
combustion calibration. Calibrate or repair as necessary.
Check to ensure gas pressure at inlet of SSOV does not exceed
1.
14" W.C. (3.49 kPa).
Page 143 of 153
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