I’ll start this off by asking for the model number.

36 degrees F shouldn’t cause any problems with the tank pressure.

 

its a El296DF110XE060

 

I wasn’t able to find an installation manual for the down flow version of the EL296. The upflow/horizontal isn’t approved for manufactured housing.

I also wasn’t able to find the installation instructions for the LP conversion kit (assuming it is the same as for the upflow).

So, right now, I’m not much help.

 

Call "Lennox" tech support. No disrespect here but why have we reached the point where people go online for everything first?

 

Is this in a mobile home? Why is it in an outside closet? What is the duct design and connection to the unit?
A combustion analysis will tell us a lot. Provide those measurements, if you have them.
What were the line and manifold pressures? Static pressure readings? What type of air filter and where is it mounted?

 

i could not find anything wrong with the furnace i checked gas pressure, pressure switch operation, i operated the frunace and every propane appliance but no drastic change and the furnace is in a outside closet so theres plenty of fresh air. this was about a month ago and today the customer txted me today and said the system was giving a E270 code witch on this particular furnace means no flame sensed/check for flame signal/ improper gas flow/ensure the igniter is lighting.

You will have to be significantly more specific in your troubleshooting if you want guidance on this issue.

You can’t just say “it operated normally” or “no drastic change”. You need to post the specific numbers you saw when testing:

- actual inches of wc for both inlet and outlet pressure of the gas valve.

- actual inches of wc for the pressure switch.

- actual ignitor resistance reading.

- actual voltage being sent to the ignitor.

- actual number of seconds the ignitor stayed energize.

- actual flame sense micro-amp reading.

- actual numbers on anything else you tested.

Please help us help you.

Some intermittent issues require several visits to isolate, and actually see the problem in real time.

 

I’d make sure I was onsite checking inlet and outlet gas pressures at the gas valve next time the temps plummet. Every time we get a freeze a couple people on propane will call to say they had no heat. If you show up once it’s above freezing it works fine. But once it’s freezing the regulator at the tank doesn’t keep the pressure up. Most of the time a simple call to the customers propane company has gotten them to come change the regulator. Also if the customer lets their tanks get down to around 30% I’ll see issues like this