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I have a Mr.heater 260045. it gives a flash out code 4. I have replaced both limit switchs but it still gives the same code. Both blowers exhaust and main turn on when unit is powered up.

Mr.heater MHU45 260045 08003900

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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machtcl1
  • 61 Answers

SOURCE: Goodman furnace GMPN080-4 Getting 4 RED blinks/Open Limit Swtch

You have a limit switch located in the furnace (a little bigger than a dime and located near the center of the front panel, sometimes the switch is mounted to a small fiberglass board) . There will be two wires going to it. They sometimes trip so often that they fail to automatically reset(due to dirty filters or undersized ductwork). You can SHUT OFF POWER TO THE FURNACE, then remove the two screws holding the switch in the furnace, pull the switch out of the furnace and tap on it and wipe it off.
The switch may work a few more times but should be replaced with the same size and type. You will see some rating printed on the switch somewhere. Write down all the numbers and get a replacemet from a furnace/AC supply house. If you have a meter and know how to use it you could check the switch for continuity.

Sometimes just a tap on the switch will get it going. There will also be a couple of rollout switches that could be tripped. They have little buttons on them to reset them. If they trip it may have other issues to be solved.
Hope this helps!
Matt

Posted on Feb 01, 2009

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BRADLEYFRANC
  • 104 Answers

SOURCE: heater blower switch will only work at possion 4

Underneath the glove compartment on the passenger side is a cover which must come off,2 plastic screws holding this cover.Underneath you will find a 5 pin connector[big plug] connected to a white connector in the blower fan housing.This is called the fan resistor which controls the blower fan speed.Unclip the resistor out the housing and renew.Your problems should be solved..regards

Posted on Dec 24, 2009

  • 2598 Answers

SOURCE: ADP Garage heater model CUHP - 45A-3 LED flashes 4

Hi jump out the switch high limit or rollout it should start up

Posted on Mar 19, 2010

heatman101
  • 43501 Answers

SOURCE: Main blower fan is not starting on my York Diamond

Hi,
Check to see if the blower motor is actually getting power to it...You will have to check for power on the heating speed terminal... and the neutral wires....you should have 120v across those two wires....
If you have power then the motor is bad...if no power then the heating relay went bad on the circuit board and you will have to replace the circuit board...

That is a common problem as those relays are often to light and wear out...

Just realize that without an electrical meter to trace things through you are really just grabbing at possibilities and not really able to correctly diagnose your problem...

heatman101

Posted on Dec 08, 2010

  • 1949 Answers

SOURCE: My 1989 ford econoline 150

test and replace blower motor resistor

Posted on Mar 06, 2011

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1 Answer

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Have a gmp125-4 furance blower runs all the time checked themostat wires error code 1 blink then 2 then 3 then 5 furance works if you turn power off turn back on when heat kickes off blower comes on gives...


Sounds like limit switch issue. Furnace heats up, high temp limit switch opens, fan will stay on. GMP model is older and do not have the codes.
May be over fired, have airflow problem, to cause the limit to open.
Next time before shutting off power, try to find the limit, it has two wires that connect to a 1.5 x 2 inch card mount to the furnace fire wall. tap on it and see if the blower stops. If so replace the limit.

Sep 06, 2011 | Goodman Heating & Cooling

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I have a mr heater 75000 with a 4 flash blink code. the heater is brand new, only worked for 3 days. i have bypassed the 2 switches but still cant clear the 4 flash blink code.


According to the Owners/Installation Manual, the 4 flash blink code indicates that the High Limit or Roll Out Switch is open. This may be caused by a venting problem or high altitude operation. make sure you have the proper pressure to the heater's regulator. For Natural Gas it must be a continuous 7 water column inches.

For further information, I have included a link to your Owners Manual that you can download and print, for future reference. http://www.mrheater.com/upload/newsletter/MHU_HSU_CUH_60016_BL.pdf

Hope this helped to solve your problem.

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Heater code is flashing HLS Open What do I need to do?


Hi,
The high limit switch either needs to be rest or replaced...the heater got too hot and tripped the high limit open...

heatman101

Jan 06, 2011 | Mr. Heater MH125KT Utility

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High Limit Switch, look for a bimetal disc somewhere near the elements and apparently this is a manual reset. Should be red button in between two wires on a flat round disc.

Always turn power off when attempting electrical

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My heater fired up ran like normal then the burner shut off and the fans stayed running it is flashing code #4 hi temp over limit swith how do i reset ???


If the unit is like the one pictured then you have to switches that may have to be reset. One is located
near the burners and the other probably in same
compartment.

These switches are a bimetal disc held in by two screws and usually will have to wires going to it. in
between where the two wires clip on is a button usually red, Make sure you push it in.

If the furnace is different than the on pictured give more detail

Feb 06, 2010 | Mr. Heater Natural Gas Garage Heater -...

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Blower starts but ignitor will not fire. 3 flash fault on control board which the manual says is a pressure switch failure. worked fine when i shut it down this spring.


Jump out the switch to test it. It could have a blockage in the line or it could be bad. Check the air intake and exhaust venting, there could be a blockage it it as well.

Nov 14, 2009 | Mr. Heater MHU45LP

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I have a Goodman furnace GMPN080-4 REV B. I had the blower motor take a dive, so I replaced it with another equivalent 115 VAC 60 Hz 1/2 HP motor. I replaced the 10.0 MFD +10% -5% capacitor with a 7.5 MFD...


limit switch is on the heat exchanger black plastic about 1and1/2 in. by 2 in. with 2 wires going to it , it has 2 screws holding it in take it out and check it with an ohm meter and you should not have a reading if it is good

Feb 01, 2009 | Goodman GMS90703BXA Heater

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