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E. If pilot does not light after pre-
purge has timed out and there is
no voltage at flame safeguard
relay output terminals.
1. See technical data sheets on flame
safeguard relay.
1. Check wiring and replace if
defective.
F. If there is no heat with pilot OK
(if applicable) 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 butterfly
valve or actuator with proper
inlet pressure.
4. Burner does modulate.
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 wiring and replace if
defective.
G. If there is no heat with pilot OK
and no voltage is present at flame
safeguard relay output terminals.
1. See technical data sheets on flame
safeguard relay.
1. Check wiring and replace if
defective.
