Watts Aerco Benchmark Series Operation And Service Manual page 136

Benchmark Platinum-Edge: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
TABLE 10-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Defective SSOV.
5.
Worn Flame Detector or cracked ceramic.
1.
Defective Regulator.
2.
FLAME LOSS
Poor combustion calibration.
3.
DURING RUN
Debris on burner.
4.
Blocked condensate drain.
5.
The Heat Demand Relays on the
1.
Ignition/Stepper (IGST) board failed to activate
HEAT 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_D • GF-211 • 7/16/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Corrective Action
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 and
2.
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.
1. Press CLEAR button and restart the unit. If the fault persists,
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).
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