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The T-stat was wired correctly. Called the manufacturers tech support to help troubleshoot the problem since this was the first one of these wifi t-stat that I have seen outside of the This Old...

Ran into one of the new Nest thermostats last Friday. The customer said his AC would not shut off. Found that he had touched the T-stat after walking across new carpet and zapped it with static...

You are right I should have started at the begining. The inducer had been installed by another service tech (who is no longer doing service work), about a month before I was called. This was...

The pulse furnace is pretty much obsolete. Lennox no longer supports most parts. The ignition control has always been a problem and there is an after market replacement avaiable from Johnstone...

Code requires the heating circuits to be fused at 125% of load, this calls for 30amp protection for each 5 KW of heating element.

Thanks for all your suggestions. So far the only thing I haven't tried is the combustion analyser, didn't have it in the van. Yes it does have the dumb valve, I hate those things. I'v replaced...

The inducer for this furnace has the proper size inlet for the model. I checked to be sure the correct inducer was installed because each BTU size requires a specific inducer. Checked the burner...

Has a new inducer assy. and the pr switch closes no problem.

Roll out switch tripping on the H9mpd series furnaces is usually the result of a problem with the secondary heat exchanger. There was a problem with the oil used when the heat exchanger was formed. ...

I ran into a problem with a H9mpd075 furnace today that has me stumped. The burners ignite inside the burner tubes about .75 inches in front of the orifices, they burn there for about 30 seconds...

A very basic rule of thumb would be 500' of pipe in an extended slinky laying flat in a trench 8' deep for each ton of heat pump capacity. Space between loops at least 2'-3'. A 4ton system would...

If the furnaceis dual certified then a single pipe system is allowed but when the furnace is running it is sucking air you have spent money to heat and using it for combustion, where a two pipe...

You have my sympathy. From what I have read you have a perfect example of how not to install a heating system. a natural draft gas furnace in a closet off a bathroom (would never be allowed here)...

I'm having problems with a POOL-COM-PAK dehumidifier system. It runs fine for up to 2 days then the whole unit shuts down and the TD-2000 control panel goes blank. After 1 to 4 hours it starts back...