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What heat component is sticking on my Amana PTC153B50AM PTAC unit?

I have an Amana PTC153B50AM PTAC unit. The heat only works for 2 minutes and turns off; the fan keeps running but the heat never comes back on. I replaced the heater core which has built in limit switch, but didn't solve problem. Following the brilliant advice of a fellow questioner on this board, I slapped the side of the unit by the control box hard, which made the heat come on again. After several rounds of this, the unit appears to be working properly. What is the component which is sticking so I can replace so this won't happen again?

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The problem is a contact on the control board. The heat control contact is in one of the small black boxes on the control card. Whacking the side caused some mechanical obstacle to release. If it occurs again, you will probably need a new control card.

Posted on Dec 11, 2014

  • Nathaniel Persson
    Nathaniel Persson Dec 14, 2014

    Happy Valley Air was correct. To clarify, the small black boxes are called relays. I replaced both marked "heater 1" and "heater 2". Fixed the problem. Can order relays from Digi-Key for $4, but you have to solder them into the circuit board. Or buy a new circuit board for $100.

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Posted on Jan 02, 2017

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SOURCE: I'm not getting heat from my unit..

the compressor is controled seperately from the fan, this is done with the thermostat, try turning the thermostat on then of or untill you hear the "click" sound from the thermostat. If the compressor is still not turning on this may be more than you can fix if your not familiar with electrical hvac troubleshoting... more than lilkely the thermostat may be bad, or your compressors starting components are failing...if the compressor is comming on when the unit is turned on you could have a freon leak causing no heat. hope this may help some there is just too much to write on the causes this will give you a start though!!

Posted on Jan 18, 2010

  • 3 Answers

SOURCE: Amana PTAC

I know this is late but I had to add a solution to this problem since I had the exact same problem and was able to solve it. The probelm is not your control board. On these units, the heat pump compressor will not kick in unless the temperature you set on the control panel is within 2-1/4 degrees (or 4 degrees depending on your unit model. Otherwise, the unit locks out the compressor until the electric heat coil bring the indoor temperature up to that level - and then will switch the compressor back on for heat pump operation. So the problem is not the control panel or the compressor, it the electric heat coil. The coil has two manual limit switches on it that may be tripped and should be checked. The coil can be easily accessed by shutting down the power, removing 4 screws around the air outlet, pushing the screen up and sliding the panel out the top. The power wires can remain in place while the limit switches are reset. Hope it works.

Posted on Nov 06, 2011

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