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10
TROUBLESHOOTING
(In addition to instruction manual.)
LED Status Control Status Probable Cause
None (LED not on or
flashing)
Millivolt power is not present.
Light Pilot
Gas valve is not powered.
Light pilot.
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. If set point
knob is at the desired setting
the thermostat is satisfied (no
faults).
Gas valve is powered and
waiting for the set point
knob to be turned to a
water temperature setting.
If the set point knob is
already at the desired
setting, temperature
demand is satisfied (no
call for heat).
LED strobe (two quick
flashes) and three
second pause.
Thermostat calling for heat
(no faults).
Tank temperature below
setpoint of thermostat.
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.
Two flashes and three
second pause.
Weak pilot flame detected.
System will reset when pilot
flame is sufficient.
1. Unstable pilot.
2. Pilot tube block or
restricted.
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.
Four flashes and three
second pause.
Excessive tank temperature.
System must be reset.
1. Thermowell sensor
out of calibration.
2. Faulty gas valve.