Problem Possible Cause What To Do
Unable to light
the main burner
Gas Control Problem. Contact a qualified service technician.
Incorrect wiring polarity. Make sure that the electrical supply line is
wired properly.
Unit or Electrical supply line not properly
grounded.
Verify that Electrical Supply line and unit have
proper ground connection.
Main burner does not
stay lit
Burner flame not contacting sensor rod. Call a qualified Service Technician to review
flame rectification.
Unit or Electrical Supply line not properly
grounded.
Verify that Electrical Supply line and unit have
proper ground connection.
Not enough or no hot water
Water usage may have exceeded the
capacity.
Wait for the water heater to recover
after an abnormal demand of the
water heater.
Low gas pressure. Check gas supply pressure.
The Display setting may be set too
low.
See the "User Interface" section of this
manual to set water temperature.
Leaking or open hot water faucets. Make sure all faucets are closed.
"ON/OFF" switch turned off. Turn switch "ON"
Colder supply water. Incoming water temperature might
be lower than when unit was initially
installed. This will require longer heat
up cycle.
Burner not staying on. Refer to "Main Burner" section.
Water is too hot
The Display setting is set too high. See the "User Interface" section of this
manual to set water temperature.
29
Make certain power to water heater is “OFF” before removing protective cover FOR ANY REASON.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.
VERIFY PROPER OPERATION AFTER SERVICING!
For your safety DO NOT attempt repair of gas piping, gas control burner, vent connectors or other safety devices. Refer
repairs to qualified service personnel.
NOTE: A GHE Training Manual is available, through the Technical Services Department, for a more detailed Troubleshoot-
ing and Repair Guide.
CAUTION
!
CAUTION
!
CAUTION
!
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.
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