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Coils not all working

Only one coil becomes red when heater is turned on. What are possible solutions

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Re: coils not all working

The heating coil may be broken and shorting out to the case. it is a nichrome resistance wire. replace it.

Posted on Dec 13, 2007

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Have replaced transformer, worked for a couple of days and goes back to relay kicking off

If you have had to replace the transformer, then you probably have a relay that is pulling to much power and/or the thermostat wire may have to be replaced. Most transformer on controls are 40 watt transformers and at 26 volt it should pull less than 1.6 amps. P=IxE Take a clamp on amp meter to the red wire coming from the transformer on the 24 volt side and measure the current. If greater than 1.6 amps the transformer will start overheating because it is producing more power than it is rated. If this is the condition, then before the control fuse blows if it has one check the amp draw on the various relay coils to see if they are the cause of the excess current draw. Each control coil typically draws 6 watts and for 26 volt control power means the amp draw should be about .2 amps. If you find one more than .2 amp you have found your problem. Coil to check is your main contactor for the condensing unit, reversing valve coil if you have a heat pump, sequencers for emergency heat strips, and fan relay in the air handler for a few. Your schematic should list all possible relay coils. Keep checking until you find the coil.
You could also have a control wire that has its insulation worn down to the conductor, so you may have to check the control circuit for open grounds.
If after finding the coil or open ground, the next thing you need to check is the thermostat wire. Old thermostat wire sometimes have the insulation become brittle and cracked or chewn on by pets or rodents. If you have an coil that is drawing excess amps, the entire thermostat wire can turn into a long heater and can cause the thermostat wire to degrade until the wire short out. I have seen several thermostat wires that have been overheated due to bad coils and the excess heat have causes the thermostat wire outer cover to shrink just like shrink tite and is a dead giveaway that thermostat wire needs replaced.
I know that this is a lot to check, but I have had to troubleshoot the control wiring on a lot of units and now you have the condensed knowledge of my experience on this matter.
Hope this helps

Feb 11, 2015 | Heaters

1 Answer

Laars lite 2 heater direct ignition problem

sounds like the controller (board/coils) that send voltage to the heat coil is acting up.trace the wire from the heat coil back to the component.make sure the ground wire (green) is grounded to a clean surface.

Oct 29, 2007 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

I have a CGN 300TB natural gas heater, I can light the pilot and it stays lite until I turn the knob to increase the volume. I put a new thermocoupler on but didn't help. Any suggestions.

First make sure that 3/4" of the end of the thermocouple is engulfed within the pilot flame and that it is glowing red prior to releasing the button. This takes 30 to 45 seconds usually. The thermocouple generates a miniscule amount of 1/4 of 1 volt...(250 millivolts tops).... and inside the gas valve is a saftey coil that requires that voltage to remain open electrically when you release the button which was bypassing the coil to allow pilot gas through. IF the thermocouple is not generating enough electricity, the coil will drop out....IF the coil is bad, the coil will drop out...and IF the coil is weak it will drop out. When the coil drops out, the pilot gas quits flowing and main gas cannot pass because in order for the main portion of the gas valve to open, the safety coil must be held open.

You probably either have a defective new thermocouple, dirty and small pilot light, or a totally defective or weak coil in the gas valve.

Jan 02, 2015 | Heaters

1 Answer

Coils aren't glowing red

Most of the new heaters dont glow red. Its a safety thing so it dont catch your sheets or curtains,couch,chair etc on fire. Because of the idiots in this world we cant get a good heater anymore. Thats just the way it is.

Jan 06, 2013 | Comfort Zone CZ792 Electric Utility Heater

1 Answer

Ac unit outside running and unit inside running but no air flow through vents. Why?

A good place to start is with the return air filter, check to see if it is dirty, if so replace.
Also if your evaporator coil is dirty, air cannot pass thru the fins and across the coil, or your duct work may have come apart, I would recommend checking filter first, if this does not resolve the issue, look outside at the large copper line, if ice is present, your system may not be fully charged, possible leak in a line or coil, either way , you will need a pro to repair the system because of EPA laws and also the specialty tools required to make said repair.
One other possibility is the evaporator coil is plugged , this would require going into attic where heater is located and visually inspecting the coil, if you are mechanically inclined and can open the transition between the heater and the coil, then you can do it yourself.
1. Turn power off to unit.
2. locate screws along edge of coil and remove. ( usually 1/4 or 5/16 hex chuck on cordless drill should do the trick.)
3.Carefully pull apart along seam, may need box knife if taped.
4.look at entering side of coil with flashlight, if you notice a blanket of dirt dust across coil and do not see the fins, you will need to clean it.
5.use a stiff brush like a toilet brush to remove the majority of the debris from coil with firm and gentle downward strokes, then spray coil with formula 409 (a great degreaser !!) and re assemble duct, be careful where you screw the screws in at,put back in same holes if possible.
6. tape seam up with a good duct tape to prevent air leaks.
7. turn power back on to unit and enjoy the cool air!!
Don't worry about the 409, the coil will sweat and rinse itself!!
If you have electric heat, then there will be a box coil,again turn power off!!
you will remove the side cover, and if an a coil, another inside panel,otherwise the same as above to clean.
Hope this helps, if you have any questions, please ask,

Jun 23, 2011 | Heaters

1 Answer

When we first bought the heater the coils did not turn red but they are now . what could cause this , and is it dangerous?

when you first bought the heater even if it wasnt "red" as you say did you get heat from it? now those type of heaters are good when they work. First the heater has 2 settings say low and high now in low the wattage will turn some of the elements partly red the reason you dont see it is because it is fan forced heat on those type heaters which causes the elements to look like they are not red but they are on, only low will do this. Now high will cause all elements to get "red" even while the fan is running. If there is no heat someone needs to bypass switch to see if they work.process of iliminitation.Hope this helps for you.

Jan 17, 2011 | Comfort Zone CZ792 Electric Utility Heater

1 Answer

MY RINNAi will not shut itself off, continues to run no matter what temp I set it at.

The thermostat wire is located near the floor, so it is possible there is a draft where it is located causing the heater to continually run. I turned the power off to my heater and took the front and side panel off. The thermostat wire is yellow and runs to the back. At the end of the wire is a black bulb like structure. The yellow wire is typically coiled up with extra wire. I undid the coil and re routed the wire and bulb end up to the top of the heater. Works much better now.

Jan 15, 2011 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

1 Answer

Coleman Evcon BGU12520A won't ignite

check the ignitors condition is it cracked broken burnt out etc , ifn so then it will need replacing , or check the pressure switch is working try jumping it out and see if the ignition glows ,

Apr 09, 2010 | Heaters

1 Answer

Coleman heater needs coil to hook up coleman a/c unit

your going to need a cooling coil and a condenser unit. your local contractor can get same brand from supply house. maybe online e bay

Aug 26, 2009 | Coleman Propane Forced Air Heater...

1 Answer

My heater in living room dimplex xmc718n working about nearly 24 hr without electriciti i turn off all fuses and its still working. whay is this?

This is techcrazy
The problem is due to the overheating of solenoid coils(heating coils) in the gets energized to a greater extent that it can provide enough back up when power is turned off. so better check out with your service provider so that necessary changes can be made.
Kindly rate me on the above said solution

Jan 29, 2009 | Heaters

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