Rheem XR90 Series Use and Care Manual - Page 27

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. Problem Rumbling noise Possible Causes What To Do Scale and sediment  Drain the water heater to remove scale and sediment from the tank. Refer to the top of page 24. Relief valve producing popping noise or draining Pressure build up  This is an unacceptable condition and must be caused by thermal corrected. Contact the water supplier or plumbing expansion to a contractor on how to correct this. Do not plug the closed system. relief valve outlet. Not enough or no hot water Water usage may have  Wait for the water heater to recover after an 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 water faucets.  Make sure all faucets are closed. Check valve error codes.  Refer to "gas valve error codes" information on the "Gas Valve LED Codes" section of this manual. "ON/OFF" switch turned off.  Turn "ON". Inducer 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). 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. 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. 27