Rheem Direct Vent Gas Tankless Water Heater, Use And Care Manual, Page: 31 / 36

31
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.
CAUTION: For your safety, DO NOT attempt repair of electrical wiring, gas piping, remote control, burners,
vent connectors or other safety devices. Refer repairs to qualified service personnel.
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation. VERIFY PROPER OPERATION AFTER SERVICING.
Problem Possible Cause What To Do
Not enough or no hot water. Water Shutoff valve is not fully opened.
●
Check shutoff valve and open fully.
Hot water faucet is not fully opened.
●
Open hot water faucet completely.
(The main burner goes off when
incoming water volume is
inadequate.)
Water piping is frozen.
●
Allow piping to thaw.
No electricity or water supply is cut off.
●
Check that proper power is being
supplied and/or water supply is
adequate.
Unit is not “ON”.
●
Turn the unit “ON” by the button on
the remote control.
The temperature may be set too low.
●
Increase the temperature setting.
Mixing Valve Malfunctions
(if applicable)
●
Check and replace if necessary.
Error code displayed on remote control.
●
See instructions for Error Code and if
required, contact a dealer for service.
Not enough water demand.
●
Increase water flow.
Water inlet filter clogged.
●
Clean water inlet filter.
Fixture aerator is clogged.
●
Clean aerator.
Scale buildup in heat exchanger.
●
Check for error code. If required,
contact a dealer for service.
Hot and cold water lines reversed.
●
Reverse water connections.
Water not hot enough. The temperature may be set too low.
●
Check and open the gas valve fully.
The gas valve is not fully opened.
●
Call your gas company to verify the
gas meter and gas piping size.
Gas supply pressure is low.
●
Call dealer for service.
Bleed over in one of the hot water
fixtures.
●
Decrease the temperature setting.
Water too hot. Temperature is set too high.
●
Check shutoff valve and open fully.
Water shutoff valve is not fully opened.
●
Allow more water to flow.
Small amount of water has been heated.
●
Normal operation. There is no need
to call for service.
Fan continues to rotate after hot water
faucet is closed. This function is to supply hot water
when the hot water faucet is reopened.
●
Normal operation. There is no need
to call for service.
CAUTION: Make certain power to water heater is “OFF” before removing protective cover FOR ANY REASON.