Troubleshooting Chart

For Models Using Honeywell Gas Control

Observe LED indicator on gas control. Error flash codes

are displayed with a three second pause before repeating.

Check and repair the system as noted in the troubleshooting

table below:

LED Status Control Status Probable Cause

Not on and/or
not flashingPilot flame may not be present.
Gas control is in the “PILOT” position and
the pilot flame is detected.
One flash and a three
second pause.
LED is on continuouslyGas control has recently been turned to the
“OFF” position. Wait until LED goes out
before attempting to relight.
Two flashes and a three
second pause.
Weak pilot flame detected. System will reset
when pilot flame is sufficient.
Three flashes and a
three second pause.
Tank temperature fault.
System will reset.
Pilot flame is not present.
Gas control is powered and waiting for the set
point knob to be turned to a water
temperature setting.
Gas control was turned to the “OFF” position.
1. Thermopile failure
2. Unstable pilot.
3. Pilot tube blocked or restricted.
Thermowell sensor out of calibration.

Service

Procedure
1. Lite pilot per the instructions
located on the lighting
instructions label or the
lighting instructions located in
the installation and operation
manual.
2. See Service
Procedure AG-I,
Page 7.
Normal operation. Adjust gas
control set point knob to
desired temperature level.
1. Wait for LED to go out.
2. Lite pilot per the instructions
located on the lighting
instructions label or the
lighting instructions located in
the installation and operation
manual.
1. See Service
Procedure AG-I,
Page 7
2 & 3. See Service
Procedure AG-II,
Page 10.
1. See Service
Procedure AG-III,
Page 16
Four flashes and a three
second pause.Excessive tank temperature.Thermowell sensor out of calibration.
1. See Service
Procedure AG-III,
Page 16

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LED Indicator
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