Question about Heating & Cooling
Mr.heater MHU45 260045 08003900
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
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!
Posted on Feb 01, 2009
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
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...
Posted on Dec 08, 2010
Tips for a great answer:
Feb 18, 2013 | Mr. Heater MH75KT
Sep 06, 2011 | Goodman Heating & Cooling
Apr 16, 2011 | Mr. Heater Natural Gas Garage Heater -...
Mar 22, 2011 | Mr. Heater Natural Gas Garage Heater -...
Jan 06, 2011 | Mr. Heater MH125KT Utility
Mar 19, 2010 | Star Enerco Heat HSU45 Garage Heater 45000...
Feb 15, 2010 | Mr. Heater MH125KT Utility
Feb 06, 2010 | Mr. Heater Natural Gas Garage Heater -...
Nov 14, 2009 | Mr. Heater MHU45LP
Feb 01, 2009 | Goodman GMS90703BXA Heater
23 people viewed this question
Usually answered in minutes!