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I have ptac unit there is power on the 24v transformer but no display on light on the unit

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

bobotfel
  • 236 Answers

SOURCE: PTAC UNIT QUIT WORKING

If you have a clamp tester, operate the unit with the clamp tester and check the current reading. If the current reading is normal but the reset button is tipped then there is something wrong withe power plug reset button. But if the current reading is higher than the name plate rating then there is something wrong with the unit.

Posted on Mar 09, 2008

  • 182 Answers

SOURCE: old carrier a/c unit

sounds like your contactor coil is shorting out.replace the contactor

Posted on Sep 24, 2008

  • 958 Answers

SOURCE: Carrier (outside) Coleman Evcon (inside) Air Conditioning question

transformer has just 4 leads. 2 for primary which is your 110 volts and 2 for secondary which is supposed to be 24 volts ac. if you splice the two secondary wires coming out of your transformer, you should be able to get a 24 v ac there.

the box that you are referring to could be a fire controller that in case of fire, it would shut off the fan and the compressor outside.


tnx 4 using fixya,

drcool

Posted on Oct 01, 2008

  • 3 Answers

SOURCE: GE PTAC AZ38H09DABM2 WENT DEAD..POWER OK

Could be the main control board.

Could be that somebody has been messing with the dipswitches beneath the control board.

Posted on Jan 27, 2010

KLR Monkey
  • 22 Answers

SOURCE: Amana PTAC cannot be turned on.

sound like a thermister problem, however this may also be a circuit board problem, the system is controled by the outdoor board, check to see if you have a blown inline fuse in the outdoor unit, it will be under a red case in one of the wires.

Posted on Feb 01, 2010

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1 Answer

I have a blodgett zephaire gl oven. unit kept buring up 24v transformer, was old bad centrifical switch in motor. I replaced motor with brand new one, unit still buring up 24v transformer.....why ?


A short somewhere causing it to overamp. Put a 3amp inline fuse on the secondary side (24v side) on the hot wire. This will save the transformer and blow the fuse not the transformer. The centrifugal switch prolly wasn't bad. So I would trace the wire coming off transformer and look for bare wire or loose wires. Anything that would cause a short

May 04, 2016 | Blodgett Ovens

1 Answer

Carrier ac light on board out


High voltage goes to board then to transformer. 24v comes out transformer into board. Check high voltage going to transformer if have votage but no low voltage out other side 24v then transformer is bad.

Aug 28, 2012 | Carrier Heating & Cooling

1 Answer

Goodman package unit pgb036075-1 issues. No light on control board


there is a fuse on the board which is very hard to see it is a three amp automotive style fuse most people cant find it it is purple in color look very closely using a flashlight

Aug 04, 2012 | Goodman GPC1342H21A Air Conditioner

1 Answer

I dont have 24 volt to c g r w y but my transformar have secendary volt.indicet flesing light flikar on #6. ineed to fix out side condenssor unit cantol by the tharmostatebut idont have 24v in r


Check for a fuse in the unit. make suree you have power to the transformer. There might be a door switch not making. If power is there but no 24V replace transformer.

Aug 18, 2010 | Goodman Heating & Cooling

1 Answer

I have a chance to buy several amana ptac units (ptc074D series) they are rated at 265 vac I only have 220vac. Will they work at 220vac? Is there a conversion kit needed?


The 265/277v units will not work in a 208/230v hotel without a transformer. Basically you do not want to get involved with that. When replacing your PTACs stick with the proper voltage. As far as a conversion kit, if one exists, the cost will put you right back at the cost of a new unit. If your hotel is wired for 208/230v it won't give the unit the power it needs to function properly. When looking for replacement units here's what you need to match (besides getting the proper BTUs):
Voltage
Unit size (make sure they fit in your existing sleeves)
Power cord configuration (the 265/277v will have a different power plug)
Good Luck!

May 14, 2010 | Heating & Cooling

1 Answer

I want to find the transformer for the 36 volt inside unit. Is it in the inside unit or outside unit .I have no power to the inside unit however the outside unit has power,and the inside unit appears to be...


It's a 24v transformer. Your indoor unit houses the transformer for the outdoor unit. The outdoor has a low voltage (24v) supply running to it to push in the contactor for the outdoor unit to run. If your air handler inside has no power then it will kill your LOW VOLTAGE power to the outdoor unit. You will still have the high voltage power to the outdoor unit. You may have a fuse on the switch for your air handler blown if there is one. On the disconnect switch mounted to your air handler, you will have a door to open and a fuse in there. If not, check your main breaker at the panel. If you don't know what a transformer looks like, you may want to have someone familiar with electrical of HVAC help you. To check the transformer for power, you first need power to your air handler, which you don't have. I would say that is not your problem. I would assume your air conditioner is not running outside, correct? Your problem is the power (HIGH VOLTAGE) to your air handler. Loose wires, blown fuse, tripped breaker etc...

Aug 06, 2009 | Comfort-Aire HMC36AT-1 Air Conditioner

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

1 Answer

Carrier (outside) Coleman Evcon (inside) Air Conditioning question


transformer has just 4 leads. 2 for primary which is your 110 volts and 2 for secondary which is supposed to be 24 volts ac. if you splice the two secondary wires coming out of your transformer, you should be able to get a 24 v ac there.

the box that you are referring to could be a fire controller that in case of fire, it would shut off the fan and the compressor outside.


tnx 4 using fixya,

drcool

Oct 01, 2008 | Heating & Cooling

1 Answer

No air conditioning unit inop


you lost your 24v check the transformer at the furnace at R and C treminals see if you have 24v if not your transformer is gone but you also have to have the door switch on the blower section closed and check incoming power as well

Aug 17, 2008 | Carrier 38BRC048 Air Conditioner

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