Question about Icm 303 Heat Pump Defrost Timer

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Icm 303 how do i put the icm 303 into test mode

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About the only thing I can suggest you check is the initiate termination thermostat (assuming your Heat pump works with one of these). It will be identified by 2 wires going to it and it will be clamped on the line (Not brazed on or screwed on). Now there will also be a reversing valve which has 4 tubes going to it and 2 wires. and it could have high, low, pressure switches that have 2 wires. This thermostat is usually mounted 1/3 to 2/3 way down on the coil and is suppose to be mounted on the "U - Bend" of the out door coil tubing. It usually resembles a pancake and will have a wire or metal clip that holds it securely on the coil U bend. Make sure it hasn't fallen off or come loose. This can cause your heat pump to miss its required defrost.

You can try this also. Some defrost timer boards have a set of "test pins" you put them together with a screwdriver or a piece of wire for a few seconds to initiate a defrost. It defeats the time logic in the board It should go on into defrost and stay in until the coil is cleared of frost and or about 10 minutes which ever comes first. If it comes out right away it may be the termination switch I talked about above. It could also be the board. To check out the thermostat locate the 2 wires going to it from the board. pull them off the board and retry it. Sill goes right out of defrost then jumper the 2 wires together and try it again. If it still comes out this time it most likely the board. If it stays in defrost either time when removing the wires or jumping the wires its the thermostat.

If its anything else; Well Its a little complicated and unless you understand the heat pump /refrigeration cycle and the need for defrost and how the defrost is limited and initiated, well Id say need a pro.

Hope this helps you. If so please rate me as high as you can. Thank you for using fixya and good luck.

Posted on Mar 25, 2009


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Refer to Ignition Control, Knock Sensors .

Circuit Description
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