Currently, the T1-11 is acting as a sheathing material and a finish. If you remove it, I recommend you install sheathing as it provides structural rigidity. Then you are right back to adding the weight savings back.

I can't tell if you mentioned if your home is a single or double wide... If my understanding is correct, your home's floor joists are bowed up in the middle (between the support beams) and sagging down at the outside walls? If this is the case, the key to a solution is to (as mentioned) support the ...

Does the yellow wire from the fan switch connect to Sequencer #1?

Yes, it appears you don't have a relay. But also, the model number given is for a heat only unit, therefore the heat pump system (mentioned in your other post) is probably in control of the blower anyways. You can try and check the wiring against this - http://www.nordyne.com/Literature/359a.pdf#pag...

As DaleM mentioned, it sounds like it's either the blower relay or the t-stat.

Please don't double-post the same issue.
Continue your troubleshooting conversation here - https://www.mobilehomerepair.com/phpbb/v ... f=2&t=9001

Glad you got it fixed.

Does it trip the new high limit switch? The unit could be oversized for your ductwork and home, or as DaleM says, there's a restriction. A blockage that large should be noticeable, as-in not much flow coming from vents. If the flow is adequate, then the burner/heat exchanger should be the next place...

I don't have a manual or wiring diagram for your unit, but when you mention the reversing relay, are you referring to the fan relay? Can you pull the t-stat and report back the wires present? Also, trying to clarify what the issue now is... You have sufficient heat and the blower runs fine at initia...

Check for voltage on the element side of the sequencer circuit. This of course would require a multimeter.

Have you looked at the wiring inside the unit to make sure they are all connected? Look for any burnt wires as well.

Gas valve or partially clogged orifice may be not allowing the flame to reach optimal range.

Here you can order wiring diagrams - http://www.mobilehomerepair.com/wireandparts.html

Not receiving power as in 110/220V not detected at the unit and the blower won't respond to the t-stat?

More information is needed. What was sparking?

I'm interested in the boiler setup you will have. My thoughts are this... The hydronic baseboard heaters should be fine, or radiators with covers. Sizing is everything, but I'm sure you know this since you've been through it before. But why go through the trouble of keeping the piping inside the hom...