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

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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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Posted on Jan 02, 2017

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1 Answer

The heat exchanger has burnt due to high limit safety stat


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

Nov 23, 2013 | Pool & Spa

1 Answer

High temp limit opens causing furnace to short-cycle


An adjustable high temp limit up to 215°f is acceptable in some installations. Your service tech should take a temp rise measurement. All furnaces have data, and are different per unit. That data should give a temp rise number. As if the air entering is 75°f and the air leaving is 150°f, rise is 75. This will indicate an air restriction in the furnace or poor air flow if the rise is excessive per manufacturer's specs. I've seen the insulation inside the supply air plenum come loose and block the ductworks openings, which will act as a restriction and cause the unit to overheat. A slow blower due to dirty blower wheel, damaged windings, wrong speed, weak capacitor, low voltage, or wrong motor will all cause low airflow, and will overheat. Dirty or compacted evaporator coil also. A cracked heat exchanger anywhere near the high temp limit will be a bit hard to find/detect will certainly cause the limit to open. If this unit is having an overheating issue, it's certainty an issue you may want to call in a professional to help with. Try operating the heat in medium speed at the blower. If it's tripping within a minute or less, it may indicate a heat exchanger issue. If it takes a while, 2-5 mins, then I'd suspect an airflow issue. Hope this helps you!

Sep 30, 2017 | Heating & Cooling

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

I have 2 hvac units running an electric heating element for the heater. Both limit controls are set the same. One is ignited the flames and continuing with flames for close to 3 min. The other is taking...


Hi, these Honeywell combination fan/limit controls are used for turning the fan on after the combustion changer reaches the factory setting on the round dial that you see when you remove the cover. The high limit will turn the fan on when it reaches this temperature, and off when the stat is satisfied. If the blower motor fails due to a burn out or short, it shuts the main burners down on the high limit setting. These controls can be removed and you can clean the probe which has a set of contacts at the end. Sometimes this will fix the problem. Check the settings on the dial to see if they are set right to come on, the time it takes between cycles, and the temperature they are set to shut off. This sounds as though you need to check your thermostats also. They could be a problem. You say electric heat, but then you are saying flames? If these limits have the manual fan button, make sure they are on auto. Long delays could also mean you have a dirty flame sensor located by the pilot. You can clean the metal tip with steel wool or fine sanding cloth. Short heating cycles may be your thermostats like I said before. You shouldn't have to replace the fan/limits as I told you what they control. These will cause a fan to run and not shut off after the stat is done, so check to see if they are dirty. Please keep me posted.
Shastalaker7
A/C, & Heating Contractor

Feb 12, 2011 | Honeywell L4064B2236 Fan/Limit Control...

1 Answer

My dishwasher is stuck in the rinse mode. The model # KUDD01DPPA.


Hello,

Yes, there are 2 stats, hi limit and operating. You should find them attached to the pump housing. It gets a little tricky but the problem will boil down to one of the stats is bad or the heating element itself is bad [or something like a wire burned off at the element which will be obvious]. It can get a little tricky. I would start by checking to see if the element gets hot during operation. If no, ohm test the element itself. If ok, ohm test the high limit stat, it should be closed at room temp. If ok, try bypassing the operating stat and see if the element now gets hot during operation. Replacing the element and/or stats is not too hard except for the limited space to work underneath the machine.
Good luck...

Jul 07, 2010 | Dishwashers

1 Answer

Burners on our Brivis Buffalo 52 Ducted heater aren't getting gas


test thermosat for proper operation ie-broken wire-power if good jump stat and check if unit goes on if it does than stat internal problem or wiring problem and needs replacement or repair --if stat good check fan safety/high limit sensor if good would need to check and test thermocouple thats the tube that the pilot flame burns on may be enough to keep pilot burning but not enough to open valve for heat demand

May 31, 2010 | Heating & Cooling

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

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...

2 Answers

Clothes dryer wont heat up


is there an over temp switch bad? or power to element?

Apr 14, 2009 | Dryers

1 Answer

I have a ck20 hobart deep fryer that when plugged in and turned on, lights both lights,but does not heat.I checked both fuses with an ohm meter and they appear to be fine.Can you tell me what the...


The element will show infinite resistence if defective. Overload switch.....Do you mean High Limit T/Stat? Use your ohm meter across terminals- should read closed circuit...0 ohms. If not, push red reset button...if clicks once, is now reset and contactors will close and unit will heat. If always clicks, replace limit t/stat Like wise, check themostat--should click once for heat demand and check cicuit same as limit t/stat. May have wire burned off terminal connector at element.

Mar 30, 2009 | Hobart 1HF50D Deep Fryer

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