EXCESSIVE POPPING OR BACKFIRING
CAUSE REMEDY
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.
EXCESSIVE SMOKING AT EXHAUST PORT AND BUILDUP OF CARBON IN HEAT
EXCHANGER
CAUSE REMEDY
Air inlet tube blocked Check for plugged or blocked air inlet tube
and clear if necessary.
Low voltage Check for low voltage, at least 11 VDC.
Defective pressure regulator Check for defective pressure regulator.
There should be 11 inches water pressure in
the propane supply line at the connector.
HEATER DOESN’T SWITCH OFF AFTER PURGE (COOL DOWN) CYCLE
CAUSE REMEDY
Flame switch will not open Replace
T300-1_T500-1_T780
Troubleshooting
426 P/N 12261-683
REVISED: January 2015
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