State GPH-90N - Manual (Page 51)

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These guidelines should be utilized by a qualifi ed service agent.
Problem Possible Cause(s) What to do
NOT ENOUGH HOT WATER STANDBY button turned off. Press switch to turn heater on.
No power at outlet. Repair service to outlet.
Error Code being displayed Refer to “FAULT INDICATION AND
ERROR CODES” section and Table
5 or call service agency or dealer.
Set point set too low. Adjust Set point higher.
Heater undersized. Reduce hot water use.
Low gas pressure Contact dealer.
Incoming water is usually cold. Allow more time for heater to reheat.
Leaking hot water pipes of fi xtures. Have plumber check and repair
leaks.
CONDENSATION Water on the fl oor under heater. See CONDENSATE section.
WATER LEAKS Improperly sealed, hot or cold supply
connections, relief valve, drain valve
or thermostat threads. Check for leaks. See Figure 41.
Leakage from other appliances or
water lines. Inspect other appliances near water
heater.
Condensation of fl ue products. Refer to CONDENSATE section.
LEAKING T&P Thermal expansion in closed water
system. Install thermal expansion tank (Do
not plug T&P valve).
Improperly sealed valve. Check relief valve for proper
operation (Do not plug T&P valve).
HOT WATER ODORS (refer to
cathodic protection) High sulfate or mineral content in
water supply. Drain and fl ush heater thoroughly
then refi ll.
Bacteria in water supply. Chlorinate water supply.
HOT WATER TOO HOT Thermostat set too high. Refer to TEMPERATURE
REGULATION section.
WATER HEATER SOUNDS Condensation dripping on burner. Refer to CONDENSATE above.
SIZZLING - RUMBLING NOISE Sediment at bottom of heater tank. Clean sediment from tank. Refer to
DRAINING.
SOOTING Improper combustion. Refer to Air Requirements.
BURNER WILL NOT STAY LIT-
GOES OUT 4-5 SECONDS High ambient room temperature. Contact a qualifi ed service agency to
determine cause.
Defective Control board. Replace Control board.
Damaged Flame Sensor
(Error code E35) Replace Flame Sensor
VENT GAS ODORS Lack of air supply. Shut off water heater immediately
and contact a qualifi ed service
agency to determine cause.
Improperly installed vent piping.
Downdraft
Poor Combustion
THERE IS NO WATER AT ALL
WHEN THE HOT WATER TAP IS
OPENED. The unit display is fl ashing an error
code. Check if there is any error code
fl ashing on the remote controller.
TABLE 6
TROUBLESHOOTING