Watts Aerco Innovation 800 User Manual page 96

Innovation Hot Water Hot Water Boiler User Manual
TABLE 7-1. HOT WATER BOILER TROUBLESHOOTING – Continued
FAULT INDICATION
FLAME LOSS Worn Flame Detector or cracked
1.
DURING RUN ceramic.
Defective Regulator.
2.
Poor combustion calibration.
3.
Debris on burner.
4.
Blocked condensate drain.
5.
HEAT DEMAND The Heat Demand Relays on the
1.
FAILURE Ignition/Stepper board failed to
activate when commanded.
Relay is activated when not in
2.
Demand.
HIGH EXHAUST
Poor combustion calibration.
1.
TEMPERATURE
Heat exchanger has scale.
2.
HIGH GAS Incorrect supply gas pressure.
1.
PRESSURE
Defective SSOV Actuator.
2.
Defective High Gas Pressure
3.
switch.
Page 96 of 174
11/15/2016
CHAPTER 7 – TROUBLESHOOTING GUIDE
PROBABLE CAUSES
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
- INTERNATIONAL
CORRECTIVE ACTION
Remove and inspect the Flame Detector for signs of wear
1.
or cracked ceramic. Replace if necessary.
Check gas pressure readings using a gauge or
2.
manometer into and out of the Air/Fuel Valve to ensure
that the gas pressure into and out of the valve is correct.
Check combustion calibration. Adjust as necessary.
3.
Remove the burner and inspect for any carbon or debris.
4.
Clean and reinstall.
Remove blockage in condensate drain.
5.
Press CLEAR button and restart the unit. If the fault
1.
persists, replace Ignition/Stepper (IGST) Board.
Defective relay. Replace IGST Board.
2.
Check combustion calibration using procedures in
1.
Chapter 4.
Clean heat exchanger using procedures in Chapter 6.
2.
Check to ensure that gas pressure at inlet of SSOV is not
1.
above 14" W.C. (3.49 kPa).
If gas supply pressure downstream of SSOV Actuator
2.
cannot be lowered to below 3.0" W.C. (747 Pa) using the
gas pressure adjustment screw (see section 4.3, step 13),
the SSOV Actuator may be defective.
Remove the leads from the High Gas Pressure switch
3.
and measure continuity across the common and normally
closed terminals with the unit not firing. Replace the
switch if it does not show continuity.
OMM-0120_0A
GF-128-I