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Posted on Feb 03, 2011
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What does error code p8 mean - Mitsubishi Heating & Cooling

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R Subramaniyam Iyer

R Subramaniyam Iyer

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  • Master 2,133 Answers
  • Posted on Feb 03, 2011
R Subramaniyam Iyer
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P8 means Abnormality in outdoor unit.
Check:
1) Wrong wiring of indoor/outdoor
connecting wire
2) Reversed phase
3) Protection device is working
4) Damaged outdoor coil thermistor

Solution:
1) Check the indoor/outdoor connecting wire.
2) Change the connection of electric wiring.
3) Check the protection device.
4) Measure the resistance of the outdoor coil thermistor.
If the resistance is normal, replace the
outdoor controller board

Hope, helpful.

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  • Contributor 40 Answers
  • Posted on Mar 12, 2014
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P8 : diagnosis of malfunction outdoor unit malfunction inspected unit outdoor.

Air Conditioning Fault Codes

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hvac1960

R Subramaniyam Iyer

  • 2133 Answers
  • Posted on Jan 31, 2011

SOURCE: CAN YOU TELL ME WHAT THIS ERROR CODE MEANS P8

P8- Abnormal temp of out door. If new unit, check gas pressure, may be over charged. Release some gas. If existing a/c, check condenser coil- dusty- clean it. Check f.motor- less rpm-replace capacitor. F.motor mechanism locked- replace motor. If above all o.k., non-condensate gas inside. Release all gas, flush out, replace filter drier and vacuum. And do gas charging. Thanks, helpful.

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