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The heat exchanger has burnt due to high limit safety stat

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Okay, Replace the exchanger.
As far as the 2nd part of your request = ???

Posted on Jan 29, 2014

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Posted on Jan 02, 2017

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SOURCE: The heat exchanger is burning due to high limit saftey stat. What should I do

The high limits are designed to shut the heater off if the water temp exiting the heat exchanger gets too high. One is set at 135f the other at 150f. The thermostat should shut the heater off once the pool water gets to temperature.

I'm not sure what you mean by "burning". The operating temp in a 400K btu heater is around 2000 degrees. If you are getting a lot of "sooting" that is typically caused by low gas supply. That's where you get orange flame instead of blue flame. Can you give me more detail?

Posted on Nov 24, 2013

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The heat exchanger is burning due to high limit saftey stat. What should I do


The high limits are designed to shut the heater off if the water temp exiting the heat exchanger gets too high. One is set at 135f the other at 150f. The thermostat should shut the heater off once the pool water gets to temperature.

I'm not sure what you mean by "burning". The operating temp in a 400K btu heater is around 2000 degrees. If you are getting a lot of "sooting" that is typically caused by low gas supply. That's where you get orange flame instead of blue flame. Can you give me more detail?

Nov 23, 2013 | Pool & Spa

1 Answer

Put new thermal limiting switch, thermal fuse and heating element in my whirlpool estate elec. dryer. it will not get hot still is there something i,m missing?


their are several possibilities

1) check breaker and or fuse to be supplying 240 volts to the dryer,even though the breaker seems to be on a internal burned out breaker will appear to be set but 240 vac not at dryer

2) check were the cord connects to back of dryer that one on the legs hasnt burnt and only 120 vac to dryer instead or required 240 vac

3)depending on your model i dont know if you have a timer or computer control but it isn't sending power to the element

4) the motor switch could be defective, all dryers are required by law to have a built in safety that assures the dryer will not heat when it isn't running to do that all dryers have a switch built into the motor that will only send power to the element once its running

5) in addation to the high limit t-stat and thermal fuse all dryers (depending on model) have a cycling t-stat or thermistor that controls the normal operating temp (the high limit and thermal fuse only come in to play when a dryer overheats) that could be defective

Jul 22, 2011 | Whirlpool Washing Machines

1 Answer

Electric dryer spins no heat, replaced heater element and high limit thermostat, tested thermal fuse and it does have 0 ohms, thermistor reads ~50 ohms.


in addation to checking the high limit t-stat have you checked the thermal cut off (the small t-stat) on the heater housing where the element fits into, the high limit t-stat and the thermal cut off BOTH shoud have 0 ohms (the thermal fuse is in the blower housing) the cut off is on the heater box, if you have checked those to be good, check that the heat relay on the control board is closing and sending power to the element, if not replace the control, if all above are good then the motor switch is bad and not sending power to the element(thats a built in safety feature so the dry would never heat when the motor isnt running)the element of course heats only when 240 volts ac is to the element ,120vac from the relay on control through the high limit t-stat then through the thermal cut off finally to the element and 120vac from the motor switch for a comined 240 vac

Jul 20, 2011 | Kenmore Dryers

1 Answer

My goodman furnace, model number GDS80703AXBB has a red light bllinking 4 times and the panel says it means open high limit... how do i fix this?


Hello, a limit switch will open when the furnace gets too hot, the switch senses that the temperature is too hot and shut down the furnace for safety. Uusally a limit switch will open because of lack of airflow across the heat exchanger, this could be due to a dirty air filter, dirty blower wheel, or the blower motor itself is not running at the proper speed. I hope this helps.

Feb 16, 2011 | Heating & Cooling

1 Answer

Hello. My Whirlpool LER7646EQO does not heat. Everything appears to work except the heat. I unplugged unit and removed the back cover but do not have an ohmmeter to test the fuses. The heating coil has no...


There is a thermal cut off that will open (non reset) this comes as a kit with a high limit t/stat
but you need to figure out WHY it opened, it is due to over heating of the element
which can be poor and or no air flow, faulty cycle (temp) t/stat or moving parts (seals,rollers etc)
worn out.

Jan 24, 2011 | Whirlpool Dryers

1 Answer

T-stat turns gas valve on,burner lightsburns long enough for fan stat to turn on fan,high limit shuts off gas valve,fan shuts off;repeats cycle


Probable causes include crack in heat exchanger, dirty pilot, bad high limit switch or bad gas valve. A crack can allow the fan to blow the flame off of the thermocouple or flame sensor. A dirty pilot will cause the same effect. The bad limit switch could cycle the system and a bad gas valve could be shutting off gas supply to unit.

Dec 02, 2009 | Off The Wall Heating & Cooling

1 Answer

We have amana ptacs with electric heat that are not heating is it the control board issuse?


You could have a high limit switch that has gone out or the heating element itself has burnt out. Both the heating element and high limit switch needs to be checked by a a/c tech due to both the location and the tools needed for the checks. The high limit switch is a safety device that prevents the unit from heating too much and possibly cause a fire. The possible cause for both of these problems is a blkockage of air flow through the system ( i.e. dirty filter, debris in the condensor coils) Good Luck on your repairs hope this has helped you some

Dave

Oct 20, 2009 | Amana PTH123B25AJ Heat Pump Air...

2 Answers

My heater will kick on right away but after 3-5mins it stops producing heat then a few mins later it will start heating again. Why?


The furnace could be shutting off on High Limit ...means your furnace is running too hot...check your filter and make sure return air vents are clean and clear....also it can be the Heat anticipator in your thermostat...which controls how many times your furnace cycles...basically your furnace should come on and off 5-6 times/hr ....need more info on your type of furnace and type of thermostat

Oct 19, 2009 | Holmes Products HCH4062 Ceramic Compact...

1 Answer

Heater not working


yor heater has 3 high limits and a flame rollout switch(aka thermal fuse). be advised that bypassing safetys is not recommended and is dangerous.these component failures are symptoms. we need to find causes.if limits are failing look at sooted or possibly a nest on your heat exchanger. if its a flame rollout problem look at obstructed burner or oriface.

Jun 22, 2009 | Pentair Minimax Ch 400,000 Btu Propane...

3 Answers

Thermal fuse location


the thermal is on the heater box on the right side it has two white wires going to it
you need to remove the high limit stat and bracket and the heating element to get to the safety stat

Jun 13, 2008 | Crosley CDE6000 Electric Dryer

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