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Thanks, EdInKentucky. Those are ideas worth considering. I’ve got a request in (waiting for a return call) for a complete Home Energy Audit from the gas company. Maybe they can track down the source of the negative air pressure. I’ve also done a temp rise test and it seems to be within the...

Thank you everybody for all your input! Here's where I'm at today. New inducer motor didn't due the trick, so I increased airflow in the basement by opening a window about 3". 2.5 days now with no issue. The temp at the exhaust draft (vent) switch only gets to 136 F. It had been opening and...

All the home vents are open and the ductwork hasn’t been worked on, so not sure it could be that. The negative pressure doesn’t make sense- don’t know if it’s been there, but I’ve had no issues w the furnace for 7 years and the vent to the outside hasn’t changed, in fact I cut some plants away 2...

Replaced the inducer motor assembly today. Failed 3 hrs later w another code 13 (limit switch). The 200° vent limit switch up to 230.1°. 10 min after a restart of the furnace and trying to get back to temp- from 63 to 70, the inducer motor is EXTREMELY hot to the touch. So is the exhaust vent...

I got of the roof to check. The chimney/exhaust vent is completely clear, but it’s still overheating at the Draft Safeguard Switch- up to 245 F on the 200 F limit switch. Any chance there could be some issue w the inducer motor? Maybe not running fast enough to blow the heat out of there??

I assume there’s some give on a 200 F limit switch (that they don’t all open at exactly 200). What might be the +/- on a 200 F limit switch?

It’s a traditional furnace. There’s an open, unblocked vent that brings outside air in from the outside right behind the furnace.

Don't know if it helps to know, but the furnace is located in an open, unfinished basement of about 900 ft2. If the furnace is running the pressure/suction in the basement makes the basement door more difficult to pull open and will suck/slam shut on it's own if it's left slightly open due to...

I had a friend recommend checking the temps overnight. I hooked up thermocouplers (engineers had some at work) to measure the max temps last night at the High Limit Switch and the Draft Safeguard Switch/vent switch. The High Limit Switch (Model HH18HA502) maxed out at 129.9 F. The Draft...

I replaced both the high limit switch (model HH18HA502) and the draft safeguard switch (model HH18HA493). Failed within two hours and 6 times in the next two days. I bypassed them both again and everything seems to work.

I have Carrier furnace model: 58STA090---14116. It’s about 7 yrs old and never was registered, so out if warranty. I’ve been working on this for about a month. A month and a half ago my furnace went out in the middle of the night a couple different cold nights. The blower continued to work. The...