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Muz series led flashes twice

Disconnected comp and turn power of for five min get 58volt from comp terminals when comp disconnected outdoor fan runs

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58 volts is not enough to run a compressor either your meter / reading is wrong and there should be no voltage on compressor terminals when disconnected .

Posted on Nov 30, 2014

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Posted on Jan 02, 2017

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SOURCE: Fujitsu Split System AST24RGA-W + AOT24RZAL

with the remote.....turn the fan only on.if the fan does not run its either the board or wiring.

Posted on Aug 23, 2008

SOURCE: Outdoor fan motor is not running fast enough?

Thanks for the suggestion. I figured out the problem. The replacement fan motor I bought was general fan motor. it had 5 wires. Two of them went to the capacitor (this unit has combo capacitor, 3 leg). I followed the schematic diag on the motor and connected one leg to the C and the other leg to the FAN on capacitor. what was happening, the start winding was working against the run winding in the motor. Once I switch the wires in the capacitor, fan ran at full speed. thanks again for your reply.

Posted on Oct 15, 2008

  • 10 Answers

SOURCE: Outdoor unit does not start. indoor unit fan does run.

by the sound of it the relay in the outdoor section is bad

Posted on May 31, 2009

  • 3 Answers

SOURCE: Mitsubishi Mr Slim mini split outdoor unit fan.

Check the capacitor. Rating must be within 90% of rated microfarads. If it is a dual capacitor test between C and FAN. Set your meter to read microfarads (uF).

Posted on Aug 14, 2009

  • 587 Answers

SOURCE: Gold Star mini split heat pump 24,000

On a heat pump the difference from heat to cool is the reversing valve.
In cooling or heating the Y1 terminal will always be energized, this is the contactor.
Depending on brand the reversing valve will either be energized in Heat or Cool. At the outdoor unit check to see if the reversing valve is getting 24 volts in cool, if not check to see if it is getting 24 volts in heating. The easiest way to check if the reversing valve is shifting, is to feel the big copper tube, (it is not the suction line on a heat pump) this is a refrigerant vapor line. It will be cold in cooling and hot in heating.
Check your thermostat installation instructions and heat pump installation instructions to determine the proper terminal designations for your heat pump and thermostat. There are some brands out there that use the B terminal as common to the 24 volt circuit, so you have to check the wiring and make sure this is not common.
If it is energized in Cool then the Y1 and O terminal will be energized. You will have 24 volts from common usually the C terminal to Y1 and O.
If it’s energized in Heat then the Y1 and B terminal should be energized. You will have 24 volts from common usually the C terminal to Y1 and B.
If you get heat when you’re calling for cooling or vice versa then switch the wire between the B and O terminals.

Posted on Feb 10, 2010

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The dual run capacitor is possible weak, also check all the electrical connections for tight fitting connections with can cause motor/compressor overheating.
To test a capacitor properly you need the proper test meter capable of reading uf readings(within 6% of the stated rating on the capacitor) "C" common to "F" fan and "C" to "Herm" terminal, the higher rating for compressor and the lower for the outdoor fan. [(example= 25/3uf 370v) 25uf=compressor, 3uf=fan motor.]

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This fault code indicates a communication error between the indoor and outdoor units; this is usually caused
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If the Voltage is not present disconnect the terminal 5 cable, test the Voltage between this wire (Red probe)
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