AERCO Innovation (G-10-1350 to G-11-0563) - Manual (Page 83)

Chapter 7 Innovation Series Water Heaters
GF-128
Troubleshooting Guide USER MANUAL OMM-0079_0B
PR1 - 07/21/11 AERCO International, Inc.
· 100 Oritani Dr. · Blauvelt, NY 10913 · Ph: 800-526-0288
Page 83 of 200
TABLE 7-1. WATER HEATER TROUBLESHOOTING – Continued
FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION
RESIDUAL
FLAME
1. SSOV not fully closed.
2. Defective Flame Detector
1. Check open/close indicator window of Safety Shut-Off Valve
(SSOV) and ensure that the SSOV is fully closed. If not fully
closed, replace the valve and or actuator.
Close the 1” Gas Shut-Off Valve downstream of SSOV (Figure
7-1). Install a manometer or gauge at the leak detection port
between the SSOV and Gas Shut Off Valve. If a gas pressure
reading is observed replace the SSOV Valve and/or Actuator.
2. Replace Flame Detector.
SSOV FAULT DURING
PURGE
See SSOV SWITCH OPEN
SSOV FAULT
DURING RUN
SSOV switch closed for 15 seconds
during run. 1. Replace or adjust microswitch in SSOV actuator. If fault
persists, replace actuator.
SSOV RELAY
FAILURE
1. SSOV relay failed on IGST board.
2. Floating Neutral.
3. Hot and Neutral reversed at SSOV.
1. Press CLEAR button and restart unit. If fault persists, replace
Ignition/Stepper (IGST) Board.
2. The Neutral and Earth Ground are not connected at the source
and therefore there is a voltage measured between the two.
Normally this measurement should be near zero or no more than
a few millivolts.
3. Check SSOV power wiring.
SSOV
SWITCH OPEN
1. Actuator not allowing for full closure
of gas valve
2. SSOV powered when it should not
be
3. Defective Switch or Actuator
4. Incorrectly wired switch.
1. Observe operation of the Safety Shut-Off Valve (SSOV) through
indicator on the Valve actuator and ensure that the valve is fully
and not partially closing.
2. If the SSOV never closes, it may be powered continuously.
Close the gas supply and remove power from the unit. Refer
fault to qualified service personnel.
3. Remove the electrical cover from the SSOV and check switch
continuity. If the switch does not show continuity with the gas
valve closed, either adjust or replace the switch or actuator.
4. Ensure that the SSOV Proof of Closure switch is correctly wired.
STEPPER MOTOR
FAILURE
1. Air/Fuel Valve out of calibration. 1. Perform Stepper Test per GF-112 (para. 6.3.5) to ensure
stepper motor rotates properly from 0% (fully closed) to 100%
(fully open) positions. Verify VALVE POSITION bargraph and
dial on the Air/Fuel Valve track each other to indicate proper
operation. If operation is not correct, perform the Stepper
Feedback Calibration (GF-112, para. 6.2.1).