Horton HT650 - Page 11

PROBLEM PROBABLE CAUSE SOLUTION
Fan Drive
cycles
frequently
Electrical Problem
1. Poor ground wire
connection.
2. Improper temperature
control settings.
3. A/CPressureSwitch
setting too low.
4. Restriction in front of
radiator,blockingairow.
5. Faulty Thermal Switch.
6. FaultyAir-TempSwitch.
1. Check electrical
connections.
2. Check temperature
setting of all controls.
T h e r m a l S w i t c h
setting should engage
the Fan Drive 10
0
F
higher than the full
open temperature of
the thermostat.
3. C h e c k  t h e  A / C
Pres s u re S w i tch .
Usehigherswitch.
4. Check for shutter
oper a t ion , winter
fronts, or obstructions
i n f r o n t o f t h e
radiator.
5. Replace the Thermal
Switch.
6. ReplacetheAir-Temp
Switch.
Air Problem
1. Air line restricted, not
allowing air to be released
from the Fan Drive.
2. S o l e n o i d Val v e n o t
exhausting.
1. Check for pinching
or plugging of the
air line between the
Fan Drive and the
Solenoid Valve.
2. Check for a plugged
exhaust port on the
S o l e n o i d Va l v e .
Clean or replace the
Solenoid valve.
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