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This
is a very common problem, whether it is an air conditioner or a heat pump.
Unfortunately, many times the service technician is dispatched only to find
a simple problem that the homeowner could have fixed himself.
Below is a list of possible causes.
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| Faulty thermostat |
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| Faulty contactor |
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| Faulty time- delay relay |
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| faulty thermostat cable |
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| Off on a safety device- (low pressure, low temp, high pressure, high
temp...) |
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| Faulty control module |
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| Thermostat not set properly |
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| Emergency or shut-off switch turned off |
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| Blown fuse in panel box |
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| Circuit breaker tripped or off- (sometimes a breaker will trip but it
won't move) |
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| Outdoor disconnect turned off- (some have an internal pull-out plug)
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| Condensate pump safety switch opened- (check pump, usually located
near indoor unit) |
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| Off on outdoor reset button |
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| Unit "locked-out"- (reset by turning off then turning back on) |
Here is
a checklist to go through before making a service call:
- Make sure there is a call from the thermostat
- Make sure no Emergency switches are turned off (including the furnace
switch)
- Make sure the breakers for the indoor and outdoor equipment are in the
"on" position- reset if necessary
- Make sure the outdoor disconnect is on- some have internal fuses or
circuit breakers- if you know how to check fuses you may do so
- If you have a condensate pump with a safety switch, check to see if
the pump is completely full of water- If so, make sure pump is plugged-in
and hose isn't clogged (could be a bad pump)
- If your outdoor unit has a "Reset Button" press it- if that was the
problem and you have to press it a second time, there is a problem and a
service call will be needed
- Your unit could have a safety device locking it out. Reset it by
turning system off at thermostat or breaker, wait 1 minute and turn back
on. Wait up to 10 minutes to see if outdoor unit starts
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