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Amana PHD42 Heat pump/AC unit blows 3ampfuse on the thermostat board

Checked the thermostat wire all seems ok.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

oscarn
  • 109 Answers

SOURCE: ptac fan keeps blowing

Try setting the fan control to "AUTO" this will cause it to cut out with the compressor.

Posted on Sep 07, 2007

  • 49 Answers

SOURCE: goodman ac / heat pump

Goodman energizes it reversing valve in the cooling mode. Usually in the "o" circuit of the thermostat wiring.You may have that wired hot somehow.

Posted on Nov 28, 2007

SOURCE: I have a Carrier 38tra048340

Blank screen sounds like a fried thermosat. Abrupt outages can affect certain types of thermostats. Make a jumper wire and jump across R and G. See if you get any action from anywhere. If a fan or compressor kicks in you know you have a burned out thermosat...

Posted on Jun 23, 2008

22yooper
  • 828 Answers

SOURCE: Goodman CK60-1C model central AC unit blwing hot air

Clicking sound is the contactor engaging to start the outside unit. Check for a burnt off wire at the contactor. For some reason you are not getting power to the outside unit. If you find a burnt off wire shut off all power to it then remake the connection at the point of the circuit break.

Posted on Jun 27, 2008

vanni7
  • 163 Answers

SOURCE: 3 amp fuse blows on a carrier 58mcb furnace board

Hi!!! Does your ac unit work fine?If not check your low voltage problem..You have a low voltage problem check the wire going out to your condensor make sure that they are not touching..Good luck..Check low voltage wires..short in progress..

Posted on Jan 04, 2009

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2 Answers

Amana Wall unit blows cold air before heating


the unit works by chilling air and the byproduct is heat in the compressor, this is used for heating in the winter and then reversed in summer to blow cold air. It has to blow cold and warm up before it can blow heat.

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My(38ycc030340)carrier heat Pump ac unit blows 5 amp fuse on board in handler in attic when switch stat to heat.


Miss wired or shorted low voltage wiring. Have you changed stat? Animal chewed wires at foundation wall or in attic?

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Unit not working correctly. The unit worked for the winter, few days ago I turn on the AC and noticed that it wasn't cooling like it should.


It's could be the board or a heat relay. See if you have 24 volts on "x2" im assuming, emergency heat when in cool mode if so it's the board. Or unhook black or x2 or your emergency heat from board and run unit in cool. If heat stays on its a relay

Jun 02, 2016 | Heating & Cooling

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RV Dometic Duo Therm roof top AC w/heat pump Model #630515.321El Serial #21631212 Yr. 2003. It is the rear unit, front unit working fine. In AC mode it is blowing hot air as if the heat pump is on. Fan...


If the Air comeing out is the same as the temp inside the RV make sure the compressor is running and not just the fans. It could be low on freon. If freon is ok then you would need to ck the wiring to the selector switch for a short. It would be obviouse because there will be melted wires. I am leaning toword low on freon since you have already been inside the wiring/control unit.

Aug 08, 2010 | Dometic Rooftop RV Air Conditioner

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I installed a Honeywell TH5220d 1029 thermostat on a American Standard AC/Heat pump and the install and setup went fine. It cooles for about and hour and quit. I found the 5 amp fuse at the furnace...


Red wire to R on thermostat red on furnace and red on heat pump Same with white except w1 on thermostat. Blue to common on thermostat common of furnace (probably brown but will be marked) and blue to common on heat pump. yellow to Y on thermostat and straight to heat pump. Orange to O on thermostat and straight to heat pump. If wired correctly with no shorts fuse problem should be solved. commonly people leave enough wire exposed inside the t-stat for wires to short together. This will blow the fuse. Hope this helps. I understand the frustration.

Jun 27, 2010 | Heating & Cooling

1 Answer

Heat Pump Unit


Yes a bad thermostat can cause the problem you describe. So can a hot wire touching a common wire or the chassis of the ac. Check all wires thoroughly. Turn the power off. Use a volt ohm meter set for continuity. Remove all wires from the thermostat.Touch one meter lead to the ground on the airhandler. Touch the other meter lead to each thermostat wire,one at a time. The only time you should get a reading of continuity is when you touch the common wire. All other wires should read open. If you have any wire reading other than common,find out where it is bare and grounded. If only the common wire reads to ground,replace the thermostat.

Sep 21, 2009 | Heating & Cooling

2 Answers

Blown Transformer heat pump


blown transformers are usually from a low voltage short the first thing i would do is wire a automotive or resetable 3amp fuse in line with the transformer so you dont blow transformer after transformer the wire coming off the transformer that say 24v take that wire a couple of inches down and cut it and install the fuse in series there
24v----------------
24v----------x----------
24v--------{3ampfuse}----------

now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
hope this will help you

Jul 26, 2009 | Ruud UBHC Air Conditioner

3 Answers

3 amp fuse blows on a carrier 58mcb furnace board


Hi!!! Does your ac unit work fine?If not check your low voltage problem..You have a low voltage problem check the wire going out to your condensor make sure that they are not touching..Good luck..Check low voltage wires..short in progress..

Jan 04, 2009 | Carrier 52CQ-312-4 Comfort Series Heat...

2 Answers

Air Conditioner malfunction


Hi, Sounds like you have a short in the control circuit to me. Turn off all power going to the unit. Write down or otherwise mark the wires leaving the control board going to the thermostat. Remove them from the control board. Replace the fuse. Turn power back on and see if the fan still runs. If it does, check and or replace the heat limit switch that brings the fan on during the heat cycle. It may just need adjusted. If the fuse blows, I would think that the control board is probably bad. If it doesn't blow, Remove the thermostat. Leaving all thermostat wires open check them with an Ohm meter. There should be no continuity between them. Twist all the wires together at one end and ohm them again at the other end. You should have complete continuity on all wires. If the wiring checks out, down power the unit. Double check your wire colors and rewire the control board. With all wires open at the thermostat, turn the power back on. Touch the RED wire to the YELLOW wire. The Condensing unit should come on. Touch the RED wire to the GREEN wire. The fan should come on. Touch the RED wire to the WHITE wire. The heat should come on. Down power the unit. Replace the thermostat. Test unit. If the fuse has lasted ok but blows now it is either wired wrong at the Thermostat or the thermostat is bad. I hope I have helped. NOTE: If you can not understand these instructions. Call a licensed Heating / Air conditioning company. kstfas

Sep 23, 2007 | Heating & Cooling

3 Answers

Ptac fan keeps blowing


Try setting the fan control to "AUTO" this will cause it to cut out with the compressor.

May 02, 2007 | Amana PTH123B25AJ Heat Pump Air...

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