Troubleshooting Tips; For Service - Ruud AP15318 Use & Care Manual

Before Y ou 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.
Problem
Not enough or no hot water.
Water not hot enough.
Water too hot.
Fan continues to rotate after hot water
faucet is closed.
CAUTION: Make certain power to water heater is "OFF" before removing protective cover FOR A NY REASON.
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation. VERIFY PROPER OPERATION A FTER SERVICING.
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.
AP15318 tankless 10 30 09.indd 27
Possible Cause
Water Shutoff valve is not fully opened.
Hot water faucet is not fully opened.
Water piping is frozen.
No electricity or water supply is cut off.
Unit is not "ON".
The temperature may be set too low.
Mixing Valve Malfunctions
(if applicable)
Error code displayed on remote control.
Not enough water demand.
Water inlet filter clogged.
Fixture aerator is clogged.
Scale buildup in heat exchanger.
Hot and cold water lines reversed.
The temperature may be set too low.
The gas valve is not fully opened.
Gas supply pressure is low.
Bleed over in one of the hot water
fixtures.
Temperature is set too high.
Water shutoff valve is not fully opened.
Small amount of water has been heated.
This function is to supply hot water
when the hot water faucet is reopened.
What To Do
Check shutoff valve and open fully.
G
Open hot water faucet completely.
G
(The main burner goes off
when incoming water volume is
inadequate.)
Allow piping to thaw.
G
Check that proper power is being
G
supplied and/or water supply is
adequate.
Turn the unit "ON" by the button on
G
the remote control.
Increase the temperature setting.
G
Check and replace if necessary.
G
See instructions for Error Code and if
G
required, contact a dealer for service.
Increase water flow.
G
Clean water inlet filter.
G
Clean aerator.
G
Check for error code. If required,
G
contact a dealer for service.
Reverse water connections.
G
G
Increase the temperature setting.
Check and open the gas valve fully.
G
Call your gas company to verify the
G
gas meter and gas piping size.
G
Call dealer for service.
Decrease the temperature setting.
G
Check shutoff valve and open fully.
G
Allow more water to flow.
G
Normal operation. There is no need
G
to call for service.
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11/9/2009 3:17:45 PM