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Problem Possible Causes What To Do
Rumbling noise Scale and sediment Drain the water heater to remove scale and sediment from
the tank. Refer to the top of page 26.
Relief valve Pressure build up This is an unacceptable condition and must be
producing popping caused by thermal corrected. Contact the water supplier or plumbing
noise or draining expansion to a contractor on how to correct this. Do not plug the
closed system. relief valve outlet.
Not enough or Water usage may have Wait for the water heater to recover after an
no hot water exceeded the capacity abnormal demand.
of the water heater.
Low gas pressure. Check gas supply pressure and manifold pressure.
The gas control (thermostat) See the “Water Temperature Setting” of The Water
may be set too low. Heater section of this manual.
Leaking or open hot Make sure all faucets are closed.
water faucets.
Check valve error codes. Refer to gas valve error code table on page 30.
“ON/OFF” switch turned off. Turn “ON”.
Blower unplugged. Plug in. Verify power supply (120VAC).
Combustion Shutoff System Contact a qualified service technician.
tripped
Water is too hot The gas control (thermostat) ● See the “Water Temperature Setting” of The Water
is set too high. Heater section of this manual.
Gas Control (Thermostat) ● Contact a qualified service technician to replace the
Defective. gas control (thermostat).
Before You Call For Service…
Troubleshooting Tips
Save time and money! Review the charts on the following pages first and you may not need to call for service.
This water heater incorporates a combustion shut off device that shuts the operation of the water heater down
if undesirable combustion conditions occur, such as the presence of flammable vapors or blockage of the
combustion air inlet openings. Please contact a Qualified Service Technician if this occurs.
CAUTION: For your safety DO NOT attempt repair of gas piping, gas control (thermostat), burners, vent connectors or
other safety devices. Refer repairs to qualified service personnel.
CAUTION: Make certain power to water heater is “OFF” before removing protective cover FOR ANY REASON.
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and
dangerous operation. VERIFY PROPER OPERATION AFTER SERVICING.