Intertherm Heating & Cooling - Answered Questions & Fixed Issues

The gas valve is seldom the issue. It is the Thermocouple, a relay or the control board. Gas appliances should only be diagnosed and repaired by a certified gas registered technician. In most countries that is the law.

The starter board controls everything. Pull it out, find a replacemeny on the internet. Make sure the power is off.

if temp sensor ok possible stuck fan relay

There is no antifreeze in the system. The system is filled with liquid gas and gaseous gas. On the heating cycle, the inside coils should get hot and the outside coils should get cold. In the summer, the heat pump reverses to provide Air Conditioning, the outside coils get hot and the inside coils get cold. They shouldn't really ice up because there is a defrost cycle. You need professional service by an Intertherm technician.

The pressure switch is a pressure sensing device to ensure the system is operating within the parameters for which it was designed. The pressure switch on the positive pressure side of the combustion air fan when tripped indicates a flu blockage which will limit the amount of flu gasses passing through the heat exchanger. I would suggest checking the flu for a blockage and if there is a second pipe (combustion air), you should check it also as with either blocked, the proper operation of the pressure switches is in jeopardy. You cannot bypass the pressure switches because the algorithym in the control module will see that the pressure switch is in the wrong position at the moment a call for heat was initiated. If there are no flue blockages apparent but you find that there is no screen on the end of the flu pipe or pipes, you may still have a blockage in the form of a dead bird. They like to roost inside the openings of the pvc pipes for warmth, then die of carbon monoxide poisoning and block the pipe. Sometimes they even make their way the full horizontal length and die at an elbow and fall directly on top of the flu opening on top of the furnace. I have had to make numerous cuts to locate blockages before.

you don't replace it. google Intertherm MGHA-75BFC-01 upper limit switch for replacements

If it burns out the transformer you have a short on the low voltage line somewhere, use an ohm meter to find the short, start by unhooking the thermostat wire

You most likely have a bad fan limit / cycling switch. If you kill the power to the furnace see if you can trace the wires from the motor to where the connect to the switch. It looks like a round button with tabs sticking out of it for the wires to connect. Mark down where the wires were connected and take it to a HVAC business or furnace supply house. Be sure to have the model off the furnace with you so you can get the correct parts.

1. Remove the grille that covers the blower compartment 2. At the blower intake, measure the height between the filter guides and estimate the approximate width that will cover the intake completely. 3. Purchase a filter or two with the closest dimensions 4. Install a new filter in the guides 5. Reinstall the grille

if when first comes on see if voltage to fan motor if yes bad motor if no voltage bad control board

Yellow flame is very bad, not only is it producing soot that worsens the problem but it is also producing an excess of poisonous carbon monoxide gas. Insufficient air is mixing with the gas to ensure complete combustion and in most case a thorough internal clean will be sufficient to restore it to good health, though checking no combustion gas is leaking from the unit is the tricky part. Faulty heaters kill people and mostly they don't even realise it. Ideally you should have the appliance professionally serviced, inspected and certified...

check pilot generator possible blocked gas line

oddly enough it has to gas furnace for it to work properly

https://www.google.com search doesn't apparently provide a shroud for sale, although perhaps someone on an RV oriented web site would be able to assist you. The following web site might be of assistance, but I didn't see that model when I looked. https://www.magicmobilehomesupply.com/Nordyne-Intertherm-HVAC-Parts-s/1827.htm

The serial number is located on the data plate.
Here is a web page describing how to decipher the year of manufacturer. (They have used different formats throughout the years).

https://www.building-center.org/intertherm-hvac-age/

Remove the housing inside the rv,and you should be able to see how it is mounted inside,then get on the roof and dismantle the top portion,they are installed in 2 pieces to prevent roof leaks.

Hello, sounds like it is either a low charge or lack of airflow, what type of filter are you using? sometimes those filters that claim to be super effecient will actually cut down on your airflow and cause the ac to freeze up.

Yes. Make sure you reconnect them as they were

try looking on this manual http://yaunco.com/pdfs/nordyne/Residential/m1install.pdf

you can try this manual http://yaunco.com/pdfs/nordyne/Residential/m1install.pdf