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Diagnosing Capacitors
• If the compressor attempts to start, or hums and
trips the overload protector, check the starting
components before replacing the compressor.
• Visual evidence of capacitor failure can include a
bulged terminal end or a ruptured membrane. Do
not assume a capacitor is good if no visual evidence
is present.
• A good test is to install a known good substitute
capacitor.
• Use a capacitor tester when checking a suspect
capacitor. Clip the bleed resistor off the capacitor
terminals before testing.
TROUBLESHOOTING PTCR’S
WHY A GOOD PTCR MAY FAIL
TO START THE COMPRESSOR
A good PTCR might not operate properly at start-up
because:
• The ice machine’s 3-minute delay has been
overridden. Opening and closing the service
disconnect or cycling the toggle switch from OFF to
ICE will override the delay period.
• The control box temperature is too high. Though
rare, very high air temperatures (intense sunlight,
etc.) can greatly increase the temperature of the
control box and its contents. This may require a
longer off time to allow the PTCR to cool.
• The compressor has short-cycled, or the
compressor overload has opened. Move the toggle
switch to OFF and allow the compressor and PTCR
to cool.
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