Troubleshooting Thermistor Components - Taylor 358 Service Manual

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Troubleshooting Thermistor Components

Step 1
Power Switch in the "AUTO" Position
Using a voltmeter, check the two terminals
connecting the transformer wires to the controller.
There should be a reading of 24 volts (¦15%); if
not, the transformer is not receiving line voltage or
the transformer is faulty and should be replaced. If a
proper reading is obtained, proceed to the next step.
Step 2
Power Switch in the "AUTO" Position
Using a voltmeter, make certain L1 power is being
supplied to the common terminal of the controller. A
reading of the line voltage should be obtained. To
accomplish this, measure the voltage between the
common terminal and any L2 power source. If a
proper reading is not obtained, make sure there is
line voltage at the incoming power supply. If there is
incoming power, back track from the common
terminal (L1) and determine where L1 is being
interrupted and correct accordingly. If a proper
reading is obtained, proceed to the next step.
Step 3
Power Switch in the "AUTO" Position
Remove the probe wires from the controller. Place a
wire between the two probe terminals of the
controller to short the component. This should
Troubleshooting
Figure 4
activate the compressor. If this procedure does not
activate the compressor, check for line voltage. If
there is line voltage at the compressor contactor
coil, the controller is acceptable.
Step 4
Power Switch in the "OFF" Position
Check the probe resistance. Disconnect both the
white (yellow) and black wires at the control, and
measure their resistance with an ohmmeter. At room
temperature, a reading of approximately 10,000
ohms should be obtained. At product temperature, a
reading of approximately 46,000 ohms should be
obtained. If these readings are not obtained, replace
the probe. When replacing the probe, fill the
bulb-well with antifreeze. Connect the white (yellow)
wire to the white terminal and the black wire to the
black terminal.
Step 5
Power Switch in the "OFF" Position
Check the anticipator microswitch by removing the
wires connecting the switch to the controller and
check for continuity. If switch continuity exists when
the draw handle is raised, the switch is effective.
Continuity should break when the draw handle is
lowered.
18
Models 358 & 359