Specifications

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Symptom Cause Remedy
E. If pilot does not light
after pre-purge has
timed out and there
is no voltage at flame
safeguard relay output
terminals.
1. Flame safeguard relay
run/test switch in test
position or is defective.
2. Burner or draft motor not
running
3. Burner or draft air
proving switch is open.
1. Place switch in run position,
see technical cut sheet on
flame safeguard relay, or
replace if defective.
2. Check wiring, fuses, and amp
draw on motors.
3. Check for correct rotation and
or adjust switch.
SECTION VII - TROUBLESHOOTING continued
G. If there is no heat with
pilot on and no
voltage is present at
flame safeguard relay
output terminals.
1. Flame safeguard relay run/test
switch in test position or is
defective.
1. Place switch in run position,
see technical cut sheet on flame
safeguard relay, or replace if
defective.
F. If there is no heat with
pilot on and voltage
is present at flame
safeguard relay output
terminals.
1. Manual gas shut-off valve
closed.
2. No gas on outlet side of
regulator with proper inlet
pressure.
3. No gas on outlet side of valve
or actuator with proper inlet
pressure.
4. Low fire start switch, SW-12
in MT-11 is open (if applicable).
5. Inlet gas pressure lower than
the required gas pressure.
6. Normally open vent valve (if
applicable) not closing.
7. Gas nozzles obstructed or
plugged.
1. Turn Heat "off-on" switch to the
"off" position. Slowly open all
manual gas shut-off valves.
2. Clear obstruction in vent
orifice or line. Check for
correct size spring. Replace if
defective.
3. Check wiring, voltage, and
adjustment. Correct wiring or
replace if defective.
4. Check for proper operation,
see sheet in manual for proper
settings.
5. Increase gas pressure.
6. Check for correct installation
and voltage. Correct or replace.
7. Clear obstruction or blockage.