Honeywell Gas Control Troubleshooting Chart
LED Status Control Status Probable Cause
None (LED not on
or flashing
Gas Control is operating normally.
Pilot flame may not be present.
Check for pilot flame through sight
glass and light if necessary.
If set point knob is in “PILOT”
position then pilot flame is
detected. Turn set point knob to
desired setting.
One flash and
three second
pause
LED on
continuously
(Solid)
Set point knob has been recently
turned to the “OFF” position. Wait
until LED goes out before
attempting to relight
Two flashes and
three second
pause
Weak pilot signal detected. System
will reset when pilot flame is
sufficient.
1. Gas Control is functioning
normally.
2. Gas Control is not powered. Light
pilot.
3. Thermopile failure.
Gas Control is powered and waiting
for the set point knob to be turned to
a water temperature setting.
Set point knob was turned to “OFF”
position.
1. Thermopile failure
2. Unstable pilot
3. Pilot tube block or restricted.
4. Resettable thermal switch has
opened
Service
Procedure
If the pilot will not stay
lit replace pilot
assembly. If problem
persists replace Gas
Control.
Normal operation.
Adjust thermostat to
desired temperature
setting.
LED will go out and the
control will function
normally whenthe pilot
is lit.
1. Seeservice
procedure RG-II
2. Seeservice
procedure RG-III
3. Seeservice
procedure RG-III
4. Seeservice
procedure RG-VIII
Flammable Vapor Ignition Resistant Water Heaters
Green LED Indicator
Observe green LED indicator on
Gas Control. Error flash codes are
displayed with a three secondpause
before repeating. Check and repair
the system as noted in the
troubleshooting table below.
Three flashes and
three second
pause
Insufficient water heating. System
will reset.
1. Temperature sensor out of
calibration
1. Seeservice
procedure RG-VI
Four flashes and
three second
pause
Excessive tanktemperature.
System must bereset.
1. Temperature sensor out of
calibration
2. Faulty Gas Control
1. Seeservice
procedure RG-VI
2. Seeservice
procedure RG-VI
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