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I think the pcb is faulty for terminals 3 and4 no condensor fan on cooling no 4 way valve on heating

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  • Tony Bruckard
    Tony Bruckard May 02, 2017

    I have changed the active for the condensor to terminal 1 main active to run unit on cooling but can't power up 4 way valve

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  • Heating & Co... Master
  • 1,089 Answers

If you got power going in but not coming out...Likely bad board. Just be sure the board is getting power.

Posted on May 02, 2017

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1 Answer

Ir400 fan numbers


II. FANS
A. Arrangement and Functions
Feeder fan
Fixing assembly heat discharge
fan 1***
Fixing assembly heat discharge
fan 2 ***
Laser driver cooling fan
Laser scanner motor cooling fan 1
Laser scanner motor cooling fan 2
Cleaner heat discharge fan
System cooling fan
Reversing guide cooling fan
Low-voltage power cooling fan 1
Low-voltage power cooling fan 2
Reader cooling fan 1
Reader cooling fan 2
Drum cartridge cooling fan 1
Drum cartridge cooling fan 2
Drum cartridge cooling fan 3
DC controller PCB cooling fan
Scanner motor cooling fan
Function
Draws copy paper to the feeding
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Discharges heat from around the
fixing assembly.
Cools the laser driver PCB.
Cools the laser scanner motor.
• Cools the laser scanner motor.
• Insulates the drum cartridge
against heat from the fixing
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• Discharges heat from the
drum cleaning assembly and
fixing assembly.
• Discharges heat from the DC
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Discharges heat from the
composite power supply and the
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Prevents curling of paper.
Discharges heat from the lowvoltage
power supply.
Cools the reader (image processor
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Cools the drum cartridge.
Cools the DC controller PCB.
Cools the scanner motor.

Aug 28, 2012 | Canon imageRUNNER 400S Copier

1 Answer

When in the cooling mode I get equal pressures and in the heating mode I get cooling pressures.


4 way valve playing up; may be coil faulty or pcb fault. Try coil - see if pulls valve open.

May 18, 2012 | Ruud Central System Air Conditioner

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Ac cools for about 5 min has right level of freon took it to mechanic said it has head pressure of 450 sets off the pressure relief valve


WHEN HIGH PRESSURE RELIEF VALVE OPENS YOU HAVE TOO MUCH REFRIGERANT IN THE AC SYSTEM OR OVERHEATED CONDENSOR,THE COOLANT FANS NOT WORKING,COULD HAVE BAD COOLING FAN RELAY OR BLOWED FUSE.THE ENGINE COOLANT TEMPERATURE SENSOR FAULTY NOT TURNING ON THE COOLING FANS TO COOL ENGINE CONDENSOR OR RADIATOR COOLANT.

Jul 23, 2011 | 2003 Mitsubishi Lancer

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Deart All: Thanks alot for your kind answer but do you had been ever heard about a maintenance guide or a fixing manual for the Hitachi RUA-30 AT3S package units . Actually the compressor did not worked...


Dear friend!
I think, you keep cool mode and temp setting above 30 degree C. Definately it will not work. If you need cool or heat follow this step and if still problem write there.
To get proper cool, keep the tips as follows:
1. Check air filter is cleaned. 2. Check indoor coil is cleaned. 3. Checkindoor blower motor is working. 4. Keep in cool mode. 5. Set temp minimum 3degrees less than room temp.6.Check compressor is working with correctpressure.

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1 Answer

My outside unit for heating and cooling keeps kicking on fan and turning off every 45 seconds or so. What could be problem


It's communication error between indoor and out door.As you don't mention any error code, normal causes for your a/c problem may be one of this.
Comms Error, check your wiring, remove external pumps. Split/Multi - check volts from terminal N to 3 = 0 - 65 Vdc, Multi V - 4 Vdc terminals 3 and 4
or

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Canon ir 400 photocopier


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1 Answer

Heated air coming out when unit is in Cool Mode


Heat pumps are sometime constructed to "Fail in the heat mode." It could be either the t'stat or the reversing valve. Be sure the t'stat is wired correctly. Usually the"O" terminal is for the reversing valve on the outdoor unit.

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1 Answer

Blower motor cycling on and off


Had this problem with a armstrong unit. Replace the board.

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HP TO HIGH IN REVERSE CYCLE


If the refrigerant charge was improperly adjusted at any time you may have the indications of an overcharge in your system causing the high pressure to trip out. The name plate on these indicates the proper charge and it is critical to the ounce.

May 27, 2008 | LG Heating & Cooling

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