Question about Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)

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Limit switches how to check a limit switch

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Take Ohem meter and check

Posted on Dec 19, 2008

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Posted on Jan 02, 2017

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Fire department says it is leaking at pressure switch, does this unit have a unloader valve and a check valve?


It would have to have a check valve and a unloader valve or it could not start again with any air pressure in the tank. The unloader is in the limit switch, should see a small plastic air line going into the limit switch, when the limit switch shuts off the electric motor it drains the pressure in the cylinder so there is no load on the compressor so it can start, so if there is air coming out of the unloader when the electric motor is shut off it is the check valve if it is coming out all the time even with the motor running it is the unloader in the limit switch.

Apr 21, 2016 | Air Tools & Compressors

1 Answer

Furnace problems


On - OK
1 Blink - Ignition failure. Check Gas flow, gas pressure, gas valve, flame sensor.
2 Blinks - Closed pressure switch. Check pressure switch (stuck in closed position).
3 Blinks - Pressure switch - failre to close. Check venter, pressure switch, vent blockage.
4 Blinks - Open limit switch. Main limit or aux limit are open. (My comment - Means overheating in chamber. Often result of blocked intake air. Bad filter. In my case, plastic wrap had been sucked into the intake. )
6 Blinks - False flame sensed. Check sticking gas valve.
Rapid continuous blinking - Incorrect twinning, incorrect primary polarity. Reverse transformer secondary leads, reverse primary wires.

Closed pressure switch can be from dirty combustion vents, bad chamber pressure - like missing screws, maladjusted gas pressure, failing pressure switch, loose hoses, moisture in the hoses or fan blades The switch need to be closed to ge the unit to work

Jan 23, 2008 | Goodman GMS90703BXA Heater

1 Answer

How to check high limit switch on theme Hester


turn all power off. remove both leads to high limit switch. take a multimeter, set it to OHMS......put leads across high limit switch....if u get a reading then switch is closed. if you get no reading then switch is open

May 04, 2014 | Rheem 266K to 399K BTU Swimming Pool...

1 Answer

What does fault code f03 mean in miele g7881 washer?


Wash water
temperature T3 in
wash block CHDESIN
not reached
within 60 minutes
Temperature limiter F2 has
cut out
Reset temperature limiter F2. See
Resetting Temperature Limiter F2
(Thermostat), 030 4.2. If necessary,
replace the temperature limiter. See
Replacing Temperature Limiter F2
(Thermostat), 030 4.3.
Heater elements do not heat
up
Check heater elements. If necessary,
replace a faulty heater element; see
Heater Element Replacement, 030 4.5..
Heater level switch does not
switch
See Heating Level Switch Does Not
Switch On, 050 3.1
Voltage (6VDC) from the
electronic not present. The
heating level switch controls
the heating relay voltage.
Check plug connections.
Check electronic module output voltage;
see 070 Fig. 5, Pos. 9.

Nov 08, 2013 | Washing Machines

1 Answer

Limit switch code flashes no inducer motor or ignition starting


usually the main blower runs non stop when limit circuit opens. Shut off the power and check each limit with the wires removed. Use your meter, check the same way as you would check a fuse. Sometimes you can tap on the main limit to reset it. Some secondary limits have a small plastic reset button in between the wires. Check this also.

Nov 27, 2011 | Goodman Heating & Cooling

1 Answer

Goodman dependable 92,7years old. Furnace works sometimes. Checked out by qualified technican. no problem found. Constant checks shows troubleshooting light blinks three (3) times. Help please. 3...


This indicates a open limit switch on the furnace, the heat exchanger is getting to hot therefore the limit switch is opening and not allowing the furnace to work properly. Did the techinician check the limit switch on the unit?

Dec 30, 2010 | Goodman GMS90703BXA Heater

1 Answer

I have a dyno glo rmc-fa100dlx forced air heater. It will light and work for a few minutes, up to about 5, then it will stop heating and the fan will keep blowing. any ideas? thanks!


If the unit comes on and runs but then shuts down, that sounds like an indication of a high limit trip.

Most, if not all, furnaces have high limit switches that keep a constant check on the temp inside the furnace or air handler. On most systems, once this high limit switch has been made (got to hot), the limit switch breaks control voltage to the heating device (strips, gas, fuel, etc.etc..). The blower motor continues to run until the high limit has dropped in temp and reset itself.

On some models, the high limit is a manual reset, meaning you need to reset the switch yourself or shut the unit off and then back on to reset it.


Check all filters and replace as necessary. Check the coils and fan blades for dirt build-up and cleanliness. Check motor belt (if applicable). If all these fail to solve the problem, then your issue either lies within the blower motor itself not moving enough air for proper heat transfer. Or the high limit switch itself is failing.

Jan 09, 2010 | Heating & Cooling

1 Answer

Dryer is not getting hot, why??


The element most likely burnt out. light a filiment in a light bulb, they do burn out. The other possiblity is the limit switches are no long working, you can check that by connecting the 2 wires that go to each limit switch, iff more than one limit. Or checking continuity across the switches. Unplug the Dryer first of course. If it is the limit switches it will run without, but replace as soon as possible to prevent overheating.

Aug 29, 2009 | Maytag Neptune MDE4000 Electric Dryer

1 Answer

Goodman GMP125-5 limit switch open


There may be as many as 6 limit switches on the furnace. The first thing to do is turn off the power to the furnace. Look around the burner box. You will see possibly 3 small maybe brown plastic swithes with two wires to each and a button between the wires. Press the button on each one. If it clicks that's the one tripped. There may also be the same kind of switch(s) in the blower compartment. There's a self resetting limit on the middle of the furnace it also has two wires but looks like a black or dark brown plate about 2 1/2 X 3 1/2 inches. You have to check that one with an ohm meter. If any of these switches are tripped there is a reason. Check your filter and overall air flow. with low airflow the furnace may overheat. The switches around the burner box are roll out switches. Watch to see if flames are coming out of the burner area. especially when the blower comes on. DO NOT bypass any of these switches. Call a certified tech. to check it out.

Mar 02, 2009 | Goodman CLJ30AR32 Air Conditioner

1 Answer

Limit Switch


It is rare that a limit switch goes bad. It is a safety control. If it is shutting off your furnace there is a problem that it is protecting you from.
If the limit switch is shutting the unit down your furnace is overheating. Check the filters. Check for any obstruction in the blower assembly. Check to see if you can raise the blower speed. Make sure all registers are open in the house. Your evaporator coil could be obstructed if you do not take good care of your filters.

Feb 28, 2009 | Goodman GMS90703BXA Heater

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