Watts AERCO Benchmark OMM-0136 - Page 143

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
OMM-0137_E • GF-211 • 12/13/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 143 of 153
TABLE 10-1: Boiler Troubleshooting Procedures
Fault
Probable Causes
Corrective Action
4. Defective Ignition/Stepper (IGST) Board.
4. If 120VAC is not present, the IGST Board in the Edge Controller
may be defective. Refer fault to qualified service personnel.
5. Defective SSOV.
5. While externally arcing the spark igniter, observe the open/close
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.
FLAME LOSS
DURING RUN
1. Worn Flame Detector or cracked ceramic.
1. Remove and inspect the Flame Detector for signs of wear or
cracked ceramic. Replace if necessary.
2. Defective Regulator.
2. Check gas pressure readings using a gauge or manometer into
and out of the Air/Fuel Valve to ensure that the gas pressure into
and out of the valve is correct.
3. Poor combustion calibration.
3. Check combustion calibration using the procedures in Section 4.4:
Combustion Calibration of this guide.
4. Debris on burner.
4. Remove the burner and inspect for any carbon build-up or debris.
Clean and reinstall.
5. Blocked condensate drain.
5. Remove blockage in condensate drain.
HEAT
DEMAND
FAILURE
1. The Heat Demand Relays on the
Ignition/Stepper (IGST) board failed to activate
when commanded.
1. Press CLEAR button and restart the unit. If the fault persists,
replace Ignition/Stepper (IGST) Board.
2. Relay is activated when not in Demand.
2. Defective relay. Replace IGST Board.
HIGH EXHAUST
TEMPERATURE
1. Poor combustion calibration.
1. Check combustion calibration using procedures in Section 4.4:
Combustion Calibration of this guide.
2. Carboned heat exchanger due to incorrect
combustion calibration.
2. If exhaust temperature is greater than 200
o
F (93.3
o
C), check
combustion calibration. Calibrate or repair as necessary.
HIGH GAS
PRESSURE
1. Incorrect supply gas pressure.
1. Check to ensure gas pressure at inlet of SSOV does not exceed
14” W.C. (3.49 kPa).