7BASIC TROUBLESHOOTING
W
EBASTO
S
CHOLASTIC
S
ERIES
7-2
7.3 Heater Test Unit (Webasto P.N. 440280)
The tester unit has been designed to quickly check the proper operation of the various heater components. By using
the tester in place of the heater control unit, you are able to manually control the heater to test components and
actually operate the unit in heating mode.
The actual testing is completed in two steps, first you perform an individual component test and then a manual start
and run test, both designed to pinpoint actual problems in the heater system.
Fig. 7-1: Test Unit P.N. 440280
LED - input power to heater
LED - control thermostat
LED - flame detector
On/Off switch - water pump
On/Off switch - motor
Push button - ignition spark coil
Push button - fuel solenoid valve
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