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13.14 Compressor Fault Diagnosis
13.14.1 Compressor Won't Start - Dead (PTC Relay Fitted)
Checks to be carried out:
1. Check the fuse and power outlet.
2 Check that there is the correct voltage from the power/control module to the compressor.
3. Continuity test from the 3-pin plug, terminal block and harness to relay.
4. Check the overload for continuity.
5. Test the PTC Relay.
Remove it from the compressor, and using an ohmmeter check the resistance through the PTC itself
between M and S terminals or 2 and 3 terminals. The PTC will have a low resistance at a low
temperature (30-60 ohms at 18
O
C).
6. With the PTC removed, check the run and start windings of the compressor using an ohmmeter. Refer
to the compressor specifications page for these figures.
Diagram
13.14.1
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