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I INSTALLED DEFROST CONTROL BOARD ICM304C ON MY HEAT PUMP CH9524VKB1 AND THE HEAT PUMP ( I THINK ITS A TEMPSTAR ALSO ) WONT START UP . CAN I JUMP- START AT THE CAPACITOR TO TEST IT? DO YOU THINK ITS A BAD CAPACITOR NOW?

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Posted on Jan 02, 2017

  • 54 Answers

SOURCE: RUUD Central Air/Heat Pump

Start with the simplest first it,s not fun but it's necessary EVERY TIME. Clean your evaporator and condenser coil, change your air filter. Getting to the evap. coil is often a real headache and a result doesn't get done often. When its clogged as you probably know the refrigerant can't absorb heat at the coil so it tries to absorb heat on the way to the compressor freezing the hot gas line the safety circuits that protect the heat pump compressor from getting liquid refrigerant back to the compressor almost immediately will take the compressor of line (looking somewhat like a defrost cycle). I hope this helps it's a tough repair GL!

Posted on Jun 08, 2008

  • 85 Answers

SOURCE: will not go into defrost

Did you change the thermostat in heat pump? or did you change it when you replaced the board?

Posted on Dec 06, 2008

  • 1214 Answers

SOURCE: tempstar heat pump: want to bypass defrost thermostat

Don't attempt to bypass defrost mode. If it's cold enough to use as a heat pump, it's cold enough to need the defrost cycle.

It sounds like a sensor issue, although it may be the controller board.

Unless you know how to work on equipment like this, I urge you to get a professional to service the unit for you.

Posted on Jan 22, 2009

  • 1 Answer

SOURCE: RUUD Central Air/Heat Pump

if it runs with the test button it's not getting a call from the stat.
check for 24 v. from common (brown) to yellow. that should give you cooling add 24 v. from common to 'B' ( blue) for heat

Posted on Oct 25, 2009

  • 99 Answers

SOURCE: My heat pump will not come on in HEAT or A/C. I

Hi; Need more info. How old is the equipment,look on the outside unit data plate it will give the built date usually in the top right corner. Also heat pumps can run with a faulty defrost board. I would check for control voltage at the secondary side of the transformer should be atleast 24 volts ac. Also the test post on the defrost board are for troubleshooting a defrost problem not an operational problem.When the posts are temporarely shorted the condensor will go into a defrost cycle This step will let the tech. know if defrost is operating normally. Also I have seen a reset switch manualy reset but not reinergize the control voltage. Also the outdoor unit has a delay timer that will wait for freon press. to equalize befor letting the unit operate. One more thing do You now if Your tstat is operating normally. One more idea is the defrost sensor if faulty it can leave the condensor in a defrost state of operation. This intern will sometimes go to heat strips because they are used in the defrost cycle to warm up the air conditioning going on durring a defrost cycle. One more thought is does the control contactor have 24 to 27 volts going to it if so replace the contactor. To test this using a voltage meter and touch after waiting 5 min. both sides of the coil. Remember voltage is deadly so ..When in doubt call a qualified tech.I ASSUME NO LIABILITY FOR INJURIES TO YOU OR THE EQUIPMENT BE CAREFULL!!! IF YOU GROUND YOURSELF BETWEEN 230VOLTS THIS BE VERY BAD...alpharome416

Posted on Jan 23, 2010

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Don't attempt to bypass defrost mode. If it's cold enough to use as a heat pump, it's cold enough to need the defrost cycle.

It sounds like a sensor issue, although it may be the controller board.

Unless you know how to work on equipment like this, I urge you to get a professional to service the unit for you.

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