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No voltage to thermostat.none to condenser vltage.main voltage to con.ison.

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If your breakers are not triped and your T-Stat is not battery operated your transformer is not putting out the 24Vac needed to power the stat. inside your airhandler there sometimes is a fuse. most times it is the same type that is in your car 5 amp yellow fuse. check it. if blown replace it. if it blows again you got a short in your low volt wiring. all a service tech. Steve

Posted on Jul 12, 2009

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Check for proper voltage to the unit , (generally 110VAC) check the transformer secondary for approx 24 volts. Verify the door switch is operating properly and that the door switch engages when the cover is put back on. if all of this proves good then check the wirtes going to the thermosta and the condenser

Posted on Jul 12, 2009

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1 Answer

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Compressor didnot turn at all, but the fan in the main machine is working. liquid pressure is all right to


You mean main machine is indoor unit? Then you have to check in condenser unit there is required voltage from indoor. If not check thermostat setting.

If you mean main machine as outdoor unit check the wires in compressor terminal. Do it only after isolating the power. Safety first.

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Have a mistral air con, outside unit not working


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1 Answer

No heat at night


You have a poor low voltage connection from the thermostat or a bad contactor.The contactor is the main relay control inside the condensing unit. The incoming voltage wires connect to it.
Contactors are inexpensive. I would change that first.
Check all your low voltage wires in the condensing unit for loose connections.

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1 Answer

Have a Ruud AC unit the problem I have after installing a new condenser fan motor when I throw the circuit breaker the unit will not turn on but when I push the contacts on the contactor in manualy the fan...


The contactor engages from low voltage power from the thermostat as does the outside condensing unit. You may have blown the low voltage transformer or have a loose thermostat wire. Check line voltage(220 volts) to the transformer. Check load voltage(24 volts) from the transformer. If no voltage out,replace the transformer. If you have voltage out(24) check the thermostat wires and the thermostat. If you have a digital thermostat there is a 5 minute delay in the thermostat after power is restored before it activates.

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1 Answer

Air con


Could be the thermostat or the low voltage line to the outside. Usually a dog chews through it or the weedeater hits it and breaks connection. Turn on cool, go outside and see if it gets 24 volts to the two wires going to contactor (have to take off cover to get to it) DO NOT TOUCH THE CONTACTOR IT HAS 240 V AT ALL TIMES, unless disconnect is thrown, so turn it off. If you aren't getting anything, then it's either the low voltage wire broken somewhere or the thermostat malfunctioning. Make sure you turn off the inside unit before messing with thermostat or you will pop the transformer. If it pulls the contactor in, and you still aren't getting anything, then check for voltage on the load side of contactor (opposite from the inlet or lead side). If you are and you hear a hum from the compressor and the condensing fan motor is running, then it's your compressor. You'll have to remove the top cover to do the next step. Check to see if it when to ground by using a meter set on resistance and with the connector to the compressor removed, put one lead on one of the copper pipes going up to it and touch the other lead against any or all of the pinouts on the compressor. If you get a reading, it went to ground and you will need a new compressor or whole new condensing unit, depending on the age of the one you have now.

Jan 27, 2008 | Heating & Cooling

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