Question about Carrier Electric Heat Strip Kit KFCEH0901N10

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Have 24 volts blowing fuse on circuit board

I HAVE A KFCEH0901N10 HEATING PACKAGE IT BLEW THE 5 AMP CONTROL FUSE THE 230/24 TRANSFORMER WAS BURNT I CHANGED THE XFORMER I NOW HAVE 26 VOLTS TO THE CARD BUT IT STILL BLOWS THE FUSE WHAT ELSE TO LOOK FOR

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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

  • 49 Answers

SOURCE: fan circuit board on a/c is blowing

You have a short somewhere in your system. It could be anything from a thermostat, thermostat wire or any component in your system. Honestly, you are better off calling a tech.

Posted on Feb 23, 2008

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

  • 435 Answers

SOURCE: I am working on a

Are you sure if the  inducer motor is working?
How did you test it? I believe the problem is with the inducer motor since it didnt turn on even after fixing the control board and also the voltage is fine.
:)

Posted on Oct 02, 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

  • 146 Answers

SOURCE: blowing the 5 amp fuse

you have a short in your low voltage wires or a bad contactor coil

Posted on May 31, 2010

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1 Answer

Thermostat fuse keeps blowing


The fuse protects the transformer from being damaged due to too much amperage, this is typically due to the circuit having a short or a device in that circuit being shorted.
See below the transformer's relationship to the thermostat.
The RED wire is the "hot leg" of the 24 volt power provided by the transformer to the thermostats R or RED terminal as pictured below.
The 24 volt hot leg enters the thermostat on R or RED.
The various other terminals White = heat, Yellow = cool ,
Green = fan and Common is the side of the 24 volt power source that every 24 volt circuit terminates or return to complete the circuit.
Thus the common name designated, note hoe everything returns to Common.
Well if we jumped Red directly to Common that is a short and will blow the fuse as you observe.
See the 2 diagrams in red describing a notrmal circuit then a short circuit.


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Mar 03, 2015 | Heating & Cooling

1 Answer

Coleman furnace dgaa077bdta


The control fuses keep blowing tells me one or more of the control that operate the control on 24 volts is malfuctioning. Most controls operate at about 5 watts and on a clamp on amp meter normally pull about 0.2 amp (p = current x voltage, 5 watts = 0.2 amps x 25 volts) I install 75 watt 24 volt transformer with a resettable overload to save on fuses. I reset the transformer and quickly go to the controls and determine the amp draw. When I find the one >0.2 amps I found the problem. The things to check is the emergency heat sequencer, fan control sequencer, reversing valve for heat pumps, main contactor on the condensing unit and any other 24 volt control loads. I have had to replace the themostat wire because the increase current for the thermostat wire can cause the entire length of wire to form a long heater and cause insulation degradationa and cause the thermostat wire to short out and blow the fuses.
Hope this helps

Aug 30, 2014 | Coleman Mobile Modular Home Gas Furnace...

1 Answer

Air conditioning thermostat not functioning


ab302475-b998-41c7-9c7c-4e106b68e0be.pngGo to your thermostat and look at the FAN switch, it will be in the AUTO position typically.
Set the FAN switch to the ON setting,
by doing this if the fan motor operates you know that the High voltage & the low voltage (24 volt control power) are present.
This saves you from having to go to the breaker panel and checking / resetting the breaker as well as checking the Transformer and automotive type 3 amp control circuit fuse (generally on the circuit board).

If you do not get any fan operation by switching the fan switch to the ON setting, you then will have to determine if the breaker, transformer and aforementioned 3 amp fuse are all good.

You will need a volt meter to test further.
At the thermostat remove the cover thus exposing the thermostats sub base and assorted circuits/wiring.

RED or R
Red is the 24 volt "hot leg" of 24 volt power which originates at the transformer. Red enters the thermostat on the Red or R terminal, some thermostats will have an RC and an RH terminal, these are jumpered together on single transformer systems as they are for Red Cool and Red Heat, without a jumper wire on RC and RH, the Red "hot leg" of the 24 volt control voltage will only energize the terminal its wired to, some stats are battery powered and do not use the transformers 24 volt power (parasitically) to power the thermostat.
If the thermostat is powered by the transformers 24 volt power, there will be a "COMMON" wire on the common terminal of the thermostat, this is the other side of the 24 volt power from the transformer, the side opposite from RED the 24 volt "hot leg"
Common is called common as its the side of power that EVERY
24 volt circuit terminates, or completes its circuit, thus the COMMON designation.
During a Heat call the 24 volt hot leg is sent out via the white/heat terminal to the gas valve etc.
So between terminals Common & White , it should read 24 volts during a call for heat.
Same for Fan which is the Green or G terminal,
Same for Cool which is the Yellow or Y terminal.
If you have no power to these terminals when calling for heat or cool or fan then yes the thermostat is defective and requires replacement.
DO NOT let the RED wire touch ground or the COMMON terminal, this is a direct short and blows the fuse or transformer
if not equipped with fuse protection.

Normally you should read 24 volts between RED and COMMON

Aug 01, 2013 | Goodman CKL36AR36 Air Conditioner

1 Answer

I have a duo therm model 57915531. i have checked the breakers all the fuses and the thermostat. i have found a 3 amp fuse in the control panel of the roof unit. this fuse was blown. i replaced it and it...


That unit has a thermostat I believe and 12 or 24 volts to power it. The 3 amps tells me it may be either line or low voltage, see manual. the fuse blows due to a short in the control circuit, a transformer if low voltage.

Sep 10, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Out thermosat for our furnace and air conditioners will not work. There is no poweer going tot he thermostat at all.


Hi, if you have no power to the stat, go to the furnace if this is a split system. Depending on the year you have, this unit may have the main circuit board with a 3 to 5 amp control fuse plugged into it. If this is what you have, check this fuse, it is the same as the fuses in your car. If you don't have this circuit board, locate the transformer where your thermostat wires come in and check for power at both the 120 volt primary side ( power in ) and see if you have 24 volts coming out of the secondary side of it. If no power in, check the circuit breaker to the furnace. If there is power in and nothing out, the transformer is gone. Check close for any breaks in the stat wires at the furnace also. I may need to have the model and serial numbers, and if its a split gas fired or a heat-pump unit if this information does not apply to your unit. Let me know.
Shastalaker7
A/C, & Heating Contractor.

Mar 11, 2011 | Coleman Heating & Cooling

1 Answer

Have a Lenox HP13 outside, and CB26 Air Handler. Just changed out the Thermostat to a Honeywell RTH7500 programable. Atached the Red to R, Orange to O/B, Yellow to Y, Green to G, Blue to C, and White to...


Hi, sounds like this is a Lennox heat pump. On the stat wiring it looks as though you wired it correctly except on the reversing valve terminals o/b, the orange wire should be on the o terminal only as the reversing valve is energized through in the cooling mode and will default to heat if the compressor fails. Make sure you have no control wires at the new stat that may have touched and blew the 3 to 5 amp fuse in you air handler. You can go to the air handler and see if the circuit board has this auto type fuse and a control board I believe it will as it may have blown. Just sounds like this is a control voltage problem as this is all you have been working with is the change out of the stat. Keep in mind that this new stat also has a built in time delay that will keep the unit off for several minutes.Check this fuse though. If you have excess to a voltage tester, you could check for 24 volts at the stat by setting it on its lowest ac volt setting and check across R to G or Common and it needs to read 24 or more volts. If not, its either a control volt 3/5 amp fuse or a faulty transformer. You say you had the breakers off, so if you happened to stripped the wires at the sub-base and the R or hot has touched the C terminal it could have taken out the transformer or just a fuse. This is where you need to look first is the control board or control module. Please keep me posted so I can get you up and running. Make sure you have the stat programmed correct also. Please let me know.
Shastalaker7
A/C, Heating Contractor

Aug 28, 2010 | Heating & Cooling

1 Answer

I replaced my thermostat last night without


check for 24 volts ac at R & C terminals at the t-stat. Your transformer will have 4 wires hooked up to it. Two on one side and two on the other. Two of them will read either 120v or 240 v ac depending on whether you have a 120 or 240 v voltage. The other side should read 24 volts. If you are not reading 24 volts, then you have burnt the transformer and will need to replace it. If you are reading 24 volts, check to see if there a low voltage fuse located on the control circuit board or somewhere between the transformer and "R" terminal.
Here's a picture of a typical low voltage transformer found in an A/C system:


If you replace the transformer, add a 5 amp fuse on one of the 24 volt leads......this will save you from having to replace another transformer in the event of future "short" in the low voltage circuit.
Contact me with any questions or concerns.

I hope you find this to be very helpful to you moving forward,

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May 09, 2010 | Heating & Cooling

1 Answer

No Power to Circuit Board


No control voltage 24 volts. The fan board if it has one. sometimes has a five amp auto fuse on it. If not sounds like the transformer. Not hard to replace.

Jun 14, 2009 | Ruud UBHC Air Conditioner

1 Answer

Circuit board burnt (goodman hotel unit)


make sure everything is wired up properly. make sure that your 24 volts is correct(low voltage and your 120 volt transformer.) make sure the breaker is the right rating /amp. check nameplate so you will know proper information

Mar 13, 2009 | Heating & Cooling

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