TROUBLE SHOOTING SUGGESTIONS GAS, OIL OR GAS/OIL BURNER
1. Burner Fails to Start
Defective On/Off or fuel transfer switch. Replace switch.
Control circuit has an open control contact. Check limits,
low water cutoff, proof of closure switch and others as
Bad fuse or switch open on incoming power source.
Correct as required.
Motor overloads tripped. Reset and correct cause for trip
Flame safeguard control safety switch tripped out. Reset
and determine cause for apparent flame failure.
Loose connections or faulty wiring. Tighten all terminal
screws and consult wiring diagram furnished with the
Frozen oil pump shaft preventing blower motor operation.
Replace oil pump.
Flame safeguard control starting circuit blocked due to
flame relay being energized. Possible defective scanner-
replace. Possible defective amplifier-replace. Scanner
actually sighting flame due to leaking fuel valve-correct
unwanted flame cause. Defective flame safeguard
Defective blower motor. Repair or replace.
2. Occasional Lockouts for No Apparent Reason
Gas pilot ignition failure. Refer to pilot adjustment
section and readjust to make certain that ignition
is instant and that flame signal readings are
stable and above minimum values. Use a
manometer or 0 to 10 W.C. gas pressure gauge
on pilot test tee to make certain that pressure is
Check for proper settings on direct spark oil ignition
electrodes. Make certain that gap is not too wide and
that light-off oil pressure is as recommended in Section
Gas pilot ignition and direct spark oil ignition. Verify that
there are no cracks in the porcelain and that transformer
end and electrode end plug in connections are tight.
Loose or broken wires. Check all wire nut connections
and tighten all terminal screw connections in panel and
elsewhere as appropriate.
With flame safeguard controls that incorporate the air
flow switch in the non-recycling circuit, ensure that when
main flame lights, the air flow switch is not so critically
set as to allow occasional momentary opening of the air
Occasional low voltage supply. Have local utility correct.
Make certain that the burner control circuit transformer (if
supplied) is correct for the voltage being supplied.
Occasional low gas supply pressure. Have local utility
Air leak in oil suction line or check valve not holding.
Correct as required.
1. Burner Motor Runs, but Pilot Does Not Light
Gas supply to burner shut off-make sure all manual gas
supply valves are open. Automatic high pressure valve
at meter such as Sentry type tripped shut due to high
gas pressure-reset valve and correct cause for trip out.
Pilot solenoid valve not opening-listen and feel for valve
actuation. Solenoid valve not being powered-check
electrical circuitry. Replace coil or entire valve if coil is
Defective gas pilot regulator-replace.
Gas pressure too high or too low at pilot orifice. Check
orifice size in gas pilot assembly. Replace if incorrect.
Refer to gas pilot adjustments for correct settings.
Readjust as required.
Defective ignition transformer-replace. Incorrect ignition
electrode settings-refer to gas pilot adjustments for
Defective flame safeguard control or plug in purge timing
card. Replace as required.
Air flow switch not making circuit-check out electrically
and correct pressure adjustment on switch if required.
Defective air flow switch replace. Air switch negative
pressure sensing tube out of position-reposition as
2. Burner Motor Runs & Pilot Lights, but Main Gas Flame Is
Main shut off or test cock closed. Check to make certain
Pilot flame signal reading too low to pull in flame
safeguard relay. Refer to gas pilot settings section and
readjust as required.
Defective automatic main or auxiliary gas shut off valves.
Check electrical circuitry to valves. Replace valves or
correct circuitry as required.
Main diaphragm shut off valve opening too slowly. Adjust
bleed on valve.
Defective flame safeguard control or plug in amplifier.
Check and replace as required.
Butterfly valve set incorrectly on modulating burner.
Readjust as required.
Main gas pressure regulator atmospheric vent line
Misadjusted main gas pressure regulator -readjust to
meet required operational values.
3. Carbon Monoxide Readings on Gas Firing
Flame impingement on cold heat transfer surfaces
caused by excessive firing rate. Reduce firing rate to
correct input volume.
Flame impingement on cold combustion chamber
surfaces due to undersized combustion chamber. Refer
to chamber size charts, pages 12 & 13 and/or contact
factory for additional information.
Incorrect gas/air ratios. Readjust burner to correct
CO2/O2 levels eliminating all CO formation. See page
36. Table 13 for additional information.