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I have a toshiba a/c unit showing fault code p03, i have found this to be a compressor high discharge temperature, what are the most likely causes of this fault please??

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Posted on Jan 02, 2017

tborn6
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SOURCE: heat pump discharge over temperature

have you changed out the filter on the inside unit lately? remember that is the condenser in the heating mode.

Posted on Feb 01, 2009

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SOURCE: COMPRESSOR NOT RUNNING, HOT

The high side/low side pressure equalization you describe is normal for a compressor sitting idle.

If you have an ohm meter you can check the compressor windings for opens and shorts. If your compressor is 3 phase as you state (this would be very unusual for a residential unit) you should have continuity across all 3 phases and no continuity to ground. Take the compressor out of the circuit before you check.

If the compressor does have crankcase heat, it should have been left on for at least 24 hours before starting the unit. Another cause for failure could be overcharging which could have resulted in refrigerant slugging back to the compressor.

Does the unit have any low or high pressure control safeties? If so, check them too - some have resets. You said the condenser fan ran so it's not likely the breaker blew, but check anyway and also check to make sure you have available power on all 3 phases.

Posted on May 03, 2009

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Noma a/c cq120 makes noise in compressor area and casing is hot to touch. Is compressor going? Is it worth to repair or buy new. I'm guessing this unit is 4 years old or more


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