I have an electric heater in a mobile home. The unit will get hot but no air comes out of the vents. But when I turn in the ax it works.

Turn on the ax?

Sorry turn on the air conditioner

Sounds like you may have a bad fan relay or if the blower is multi-speed, the heating speed may hve gone bad.

How do I check those

Do you have a volt meter & know how to use it? I'll need the make & model of the furnace so I might be able to find a wiring diagram.

Yes my husband does. Model # is c10a-042u-b. serial #is c109508-52731. Make is nordyne

To me it sounds like you have the wrong thermostat for the system or the thermostat is set up wrong. If you do not have a heat pump the problem is your thermostat.

We haven changed the thermostat and it worked with the system last year

I can't find anything on Nordyne's website with a model number anywhere close to that, at least not in the manufactured home area. The fact it has an "042" in the model number makes me think the number is for an evaporator coil.

Ok I will look Again