HEATER REMAINS ON
BURNER CYCLE AFTER
HEAT DEMANDS ARE MET
Temperature control &/or
microswitch defective or out
of adjustment
Check temperature control
switch and microswitch and
microswitch for adjustment.
Adjust, repair, or replace as
necessary.
Bi-metal blade broken or
linkage out of adjustment
Check bi-metal blade and
linkage and adjust, repair or
replace as necessary.
Dirt on fuel solenoid valve lip Clean solenoid valve lip
EXCESSIVE POPPING OR
BACKFIRING
Ignition pack defective or
inoperative
Check for spark by holding
an insulated-handle screw
driver with the shaft
grounded and the tip
approximately 1/8” away
from the high tension lug of
the ignition coil. There should
be a continuous strong
spark. If no spark is
produced, check that here is
voltage applied to the ignition
pack. If input voltage is
present and no spark or a
weak spark is produced,
replace or repair the ignition
pack.
Full voltage not available at
heater
Using voltmeter, check to be
sure full voltage is available
for heater operation, at least
11 VDC with heater turned
on. Trace system to find fault.
Solenoid defective Check solenoid. When the
START-RUN-OFF switch is in
the RUN position, the
solenoid should produce an
audible click and remain
open until heater cycles off.
In extremely cold weather,
the regulator may become
frosted. As it thaws and
freezes, the heater will burn
intermittently
No action recommended
Clogged or restricted exhaust Check exhaust for blockage
or restrictions. Clean and
clear as necessary
RT500
Troubleshooting
236 REVISED:
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