20 Most Recent Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU) - Page 12 Questions & Answers

The thermal limiting switch is not working It is supposed to preventheat. have it changed before the place burns down.

start with making sure you have aclean filter, after that make sure the blower speed is at the proper setting when the air conditioning is on---usually either high or medium high for a fixed speed system, make sure the return air vents are not blocked or restricted as well as the delivery vents not close or restricted to cause too much static pressure ( back pressure at the delivery side can reduce air flow across the a-coil ) also make sure the insulation sheet that is usually above the a-coil is not being blown down across the a-coil entryside when the blower is on. After checking all these, if you find nothing you should start by having the pressure checked --- basically comparing the pressure at the "outside unit" to the pressure at the "inside unit" or a-coil. these are high side and low side pressures. Have you done anything else to the house----attic vents, new soffits, insulation, etc that may be affecting heat gain in the house.Is it a house, mobile home or what?

Not a good idea. The fuse protects the wiring of the equipment. To high of an amperage fuse will let the wiring get hot. Being only a 15 amp fuse I assume the fuse is located on your furnace, if so your blower is drawing to many amps. Check for dirty air filters and dirty blower fins. If you have an old 60 amp house panel and that's where the fuse is located you might have additional house circuits using that fuse too pulling to many amps causing it to blow.

adjust air mixer . its a slider

The fan limiting switch is acting up. It should stay running until lower temp is reached. It will cycle until the temp stays below or at the low setting. Limit switches are adjustable.

Tjere is a limit switch that will only allow the durnace to reach a certain temp by kicking on the fan. The thermostat being unable to read the temp affects its ability to keep the furnace from exceeding your settings. *Advise not to use until corrected. Both limit switch and thermostats are inexpensive and simple to change. If in doubt, call a heat and AC tech to repair.

colman uses the furnace to power the attic vent fan . Cheaper that way I guess. It just supplies your attic fan with power so it will vent thus keeping your home a little cooler in the summer.
not a big deal. you can shut the alarm with a switch ot cut power to the alarm.

I've seen excessive draft draw the pilot flame away from the thermo couple when the burners light so when the burners shut down so does the pilot.

if the cable is broken on the bottom of the trailer jest cable splice cable if it is broke in side the suport i have 3 of them

This sounds like a bad heat exchanger. It is possible that you do not see the crack because the crack is closed when the heat exchanger is cold (or room temp). Allow the furnace to heat up, this will allow the expansion of the crack. Turn the power off and examine the heat exchanger while it is still hot.

Check inside the door panel next to the wiring schematic, you should find the diagnostic codes. Look up 7 blinks. This should narrow down the problem. ( It sounds like a bad hot surface ignitor).
Good luck.....

that sensor as you call it is a thermacouple it produces a small current which lets the gas valve know it is ok to open . if the pilot is not clean and correct it will not let main valve open. if your pilot is good then you have bad gas valve. you may have low gas pressure this can also do what you are describing

the only thing you can do is turn it off for a couple minutes and try again sometimes you get it to lite off on retry otherwise call tech

one of your door locks have a dirty connection makeing you car to think you have got a door not closed properly or one of your actuators are not lifting the buttons enough
check it out and get back to me when you find out which is the under lieing problem and we can go from there

The click noise you hear is the magnet inside the valve dropping out. Which means, the voltage that energizes it is low or interupted. Possible, weak pilot flame, bad thermocouple or bad secondary limit switch. This limit switch is located left of the main control. made of ceramic. It can also be a bad gas valve...

It's the pressure switch on the unit. Make sure that the pressure switch doesn't have debris in it that keeps it from operating smoothly. Take the tubing off from the inducer side and breath in and blow out lightly while listening for a clicking noise. If that doesn't work then I would recommend replacing it. That should solve the issue.

Maybe you don't have power going to the unit for the thermostat work.Most thermostat work off low voltages like 24 volts. May the transformer is bad.

almost all thermocouples are universal just need to know the length, ie. 18" , 20", 24" etc...

Short of being able to look at everything Its impossible to say exactly what the trouble is. Does the board have a blink code showing and a legend that says what this is? What fuel are you on NG or LP? What does the flame look like (if you can see it) IE a lot of yellow, Some orange and Blue...?. Did anyone else look at the system and the thermostat? Does it have AC or HP on it too?

The only 1 thing I may be able to offer is this. On your thermostat (if it is not electronic) there is a needle pointer that points to a number it should be around .4 to .7 if set to a lower number the thermostat will cut the unit off well before it completes a heat cycle.

Check for continuity through all your switches. Check voltage where these switches hook up to your control ignition box.if you see voltage there the problem is either the wiring or one of your switches is open. If you read no voltage there check again from "C" to the same wires a readign then indicates a bad board. Then check "R" to there a reading here indicates a bad thermostat (which is probably not your trouble due to the code and your legend of the code 4)

Hope this is cleaR and helps Please grade am accordingly and good luck.