Terex RT700 - Heater Remains On After Demand Troubleshooting; Excessive Popping or Backfiring Troubleshooting

TROUBLESHOOTING
HEATER REMAINS ON BURNER CYCLE AFTER HEAT DEMANDS ARE MET
CAUSE REMEDY
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 avail-
able 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.
RT700 Series Page 5 - 34 Issued: August 2003