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LED Status Control Status Probable Cause Service Procedure
None (LED not on
or flashing)
Gas valve is operating
normally. Pilot flame
may not be present.
Check for pilot flame
through sight glass and
light if necessary.
1. Gas valve is
functioning normally
2. Gas valve is not
powered. Light pilot
If the pilot will not stay lit
replace thermopile, see
page 10. If problem
persists replace gas
valve, see page 16.
One flash and
three second
pause.
If set point knob is in
"PILOT" position then
pilot flame is detected.
Turn set point knob to
desired setting
Gas valve is powered
and waiting for the set
point knob to be turned
to a water temperature
setting.
Normal operation. Adjust
thermostat to desired
temperature level.
LED on
continuously.
Set point knob has
been recently turned to
the "OFF" position.
Wait until LED goes out
before attempting to
relight
Set point knob was
turned to "OFF"
position.
LED will go out and the
control will function
normally when the pilot is
lit.
Two flashes and
three second
pause.
Weak pilot flame
detected. System will
reset when pilot flame
is sufficient.
1. Thermopile failure
2. Unstable pilot.
3. Pilot tube block or
restricted.
4. Resettable thermal
switch has opened.
1. See page 10.
2&3. See page 12.
4. See page 21.
Three flashes and
three second
pause.
Insufficient water
heating. System will
reset.
1. Thermowell sensor
and chamber
temperature sensor out
of calibration.
2. Possible short.
1&2. See pages 14 and
18.
Four flashes and
three second
pause.
Excessive tank
temperature. System
must be reset.
1. Thermowell sensor
out of calibration.
2. Faulty gas valve.
1. See page 14.
2. See page 16.
Observe red 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.
Gas Control Troubleshooting
Red LED
Indicator
5