Question about Hitachi Heating & Cooling

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I got an indoor unit working on fan mode only...the compressor on the outdoor unit is not kicking in...even though there is power to it..iv checked the fuses on the pc board outdoors...any suggestions anyone?

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  • nortbona Jul 21, 2008

    that makes sense...i put a uni-tester on the compressor terminals individually to earth and i got 24 volts...it seems to me that its pointing to a faulty compressor at the moment dont you think...but to test that i need to check for the 230 volts i presume..im probably sounding a bit vague arent i?

  • nortbona Jul 22, 2008

    nope i pulled the black casing off the top of the compressor and tested the 3 terminals there seperately to an earth..and got 24v lighting up on my unitester(which is probably not the most accurate tool in the book)initially i thought the problem was because the coils were filthy on the outdoor unit...but having cleaned them the compressor still wouldnt start...so unless theres some massive time delay going on...im thinking i should be testin the compressor reading ohms?????...thanks for your help

  • Tyrone Keys May 11, 2010

    What type of unit is it? Heat pump or other. How old is it? If you may share the following info I may be able to help you. The make, model and serial numbers of the indoor and outdoor units; and the make, and model number of the thermostat, You may by this time found the answer to you question.

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There are two different power voltages to these outdoor units. 24 volts in the control circuit and 230-240 volts for the compressor to operate. Checking the fuses as good does not insure that power is to the unit. You need to check the power with a volt meter.

Posted on Jul 21, 2008

  • James Helmer
    James Helmer Jul 21, 2008

    There should be no reading to ground from the compressor terminals. Lets make sure we are on the same page here. Compressor is the heart of the machine so to speak. The contactor closes and supplies the high voltage to the compressor. Are you speaking of the contactor or what?

  • James Helmer
    James Helmer Jul 22, 2008

    To test the compressor for ground you must remove the wires from the terminals. Then check for Ohm's to ground. If your system has a solid state board in the compressor control panel you may well have a time delay built into it which is designed to prevent short cycling of the compressor. These delays are normally timed to 5 minutes.

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How do I get the fault codes up on a Panasonic split air conditioning system CUE24FKR


14.2.2 To Make a Diagnosis1 Timer LED starts to blink and the unit automatically stops the operation.
2 Press the CHECK button on the remote control continuously for 5 seconds.
3 "- -" will be displayed on the remote control display.
Note: Display only for "- -" (No signal transmission, no receiving sound and no Power LED blinking)
4 Press the TIMER ? or ? button on the remote control. The code "H00" (no abnormality) will be displayed
and signal will be transmit to the main unit.
5 Each press of the button (? or ?) will increase error code
number and transmit error code signal to the main unit.
6 When the latest abnormality code on the main unit and
code transmitted from the remote control are matched,
Power LED will light up for 30 seconds and a "beep" sound
(continuously for 4 seconds) will be heard. If no codes are
matched, Power LED will light up for 0.5 seconds and no
sound will be heard.
7 The breakdown diagnosis mode will be canceled unless
pressing the CHECK button continuously for 5 seconds or
operating the unit for 30 seconds.
8 The LED will be off if the unit is turned off or the RESET
button on the main unit is pressed.
Diagnosis
display Abnormality / Protection control Abnormality
Judgement Emergency operation Primary location to verify H00 No abnormality detected - Normal operation H11 Indoor / Outdoor abnormal communica
tion > 1 min after starting
operation Indoor fan operation
only • Internal / external cable connections
• Indoor / Outdoor PCB H14 Indoor intake air temperature sensor
abnormality Continue for 5 sec. - • Intake air temperature sensor (detec
tive or disconnected) H15 Outdoor compressor temperature sensor
abnormality Continue for 5 sec. - • Compressor temperature sensor
(detective or disconnected) H16 Outdoor Current Transformer open cir
cuit - - • Outdoor PCB
• IPM (Power transistor) module H19 Indoor fan motor mechanism locked 7 times occurance
continuously - • Indoor PCB
• Fan motor H23 Indoor heat exchanger temperature sen
sor abnormality Continue for 5 sec. O
(Cooling only) • Heat exchanger temperature sensor
(detective or disconnected) H24 Indoor heat exchanger temperature sen
sor 2 abnormality Continue for 5 sec. - • Heat exchanger temperature sensor
(detective or disconnected) H27 Outdoor intake air temperature sensor
abnormality Continue for 5 sec. O • Outdoor temperature sensor (detec
tive or disconnected) H28 Outdoor heat exchanger temperature
sensor abnormality Continue for 5 sec. O • Outdoor heat exchanger temperature
sensor (detective or disconnected) H30 Outdoor discharge air temperature sen
sor abnormality Continue for 5 sec. - • Outdoor temperature sensor (detec
tive or disconnected) H33 Indoor / Outdoor wrong connection - - • Indoor / Outdoor supply voltage H38 Indoor / Outdoor mismatch (brand code) H50 Ventilation motor abnormality 7 times occurance
continuously - • Indoor PCB
• Ventilation motor H51 Nozzle lock abnormality 2 times occurance
continuously - • Nozzle H52 Limit switch abnormality - - • Indoor PCB H97 Outdoor fan motor mechanism locked 2 times occurance
within 30 minutes - • Indoor PCB
• Fan motor H98 Indoor high pressure protection - - • Air filter dirty
• Air circulation short circuit H99 Indoor heat exchanger anti-freezing pro
tection - - • Insufficient refrigerant
• Air filter dirty F11 Cooling / Heating cycle changeover
abnormality 4 times occurance
within 30 minutes - • 4-way valve
• V-coil F90 PFC control 4 times occurance
within 10 minutes - • Voltage at PFC F91 Refrigerantion cycle abnormality 2 times occurance
within 20 minutes - • No refrigerant
(3-way valve is closed) F93 Compressor rotation failure 4 times occurance
within 20 minutes - • Compressor F95 Cool high pressure protection 4 times occurance
within 20 minutes - • Outdoor refrigerant circuit F96 IPM (power transistor) overheating pro
tection 4 times occurance
within 30 minutes - • Excess refrigerant
• Improper heat radiation
• IPM (Power transistor) F97 Outdoor compressor overheating protec
tion 4 times occurance
within 10 minutes - • Insufficient refrigerant
• Compressor F98 Total running current protection 3 times occurance
within 20 minutes - • Excess refrigerant
• Improper heat radiation F99 Outdoor Direct Current (DC) peak detec
tion 7 times occurance
continuously - • Outdoor PCB
• IPM (Power transistor)
• Compressor

Note:
"O" - Frequency measured and fan speed fixed.
The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until "beep" sound heard following by pressing the "CHECK" button at remote controller.
Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors (refer to Error Codes Table) by using remote controller or Auto Switch at indoor unit. However, the remote controller signal receiving sound is changed from one "beep" to four "beep" sounds.

Oct 13, 2017 | Panasonic Heating & Cooling

Tip

Understanding Air Conditioner Electrical problems is not as hard as you can make...


Air Conditioners are broken down into two electrical systems, though they work together1. Low voltage control unit 24-28 volt control unit like thermostat and other switches and relays( also feeds compressor contactor,reversing valve, and defrost board on heat pumps)on the outdoor condensing unit .When there is no power to the thermostat,it cannot turn on the indoor fan or any other load (indoor or outdoor). In this case, first confirm there is power available (closed breaker,closed disconnect) If you have power the fan on manual switch on the thermostat should be able to turn on the indoor fan.If it doesn't, then your control voltage is most likely lost. check the transformer and 3 amp fuse in the air handler .2.The high voltage components are your compressor and your fans, both indoors and outdoors.High voltage 240 volt loads are controlled by the 24-28 volt control voltage.3. Remember, a thermostat is just a big on/off switch.4.Be careful and always play it safe when working around energized circuits5. Leave it to the pros, especially if you're inexperienced or nervous about electricity

on Aug 22, 2013 | Heating & Cooling

1 Answer

My outdoor compressor won't kick on and thermostat is not showing current temperature


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1 Answer

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1 Answer

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1 Answer

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