Quote
First visit the guy says that the draft inducer had water in it and that was affecting the system.
Assuming I understand what a draft inducer is, (is that the integrated exhaust blower motor)?
I have been battling random problems with my furnace. When I turn off the furnace switch (I don't think it cuts 24V transformer as I can hear faint buzz of it even with the switch off). The furnace also has switched outlet to which electrostatic filter was initially hooked up. I moved that to constant power and have a night light hooked up to the switched outlet which tells me when the main blower turns on.
My furnace problems are listed below and they seem to happen after running fine for close to 12-24 hours but after turning off that switch and turning it back on, it works for next 12-24 hours.
- I come back in the evening and I notice I am getting room temperature air. The main blower is on but the burner is not on. At this stage doing anything at the thermostat does nothing. The thermostat as fan auto/on and heat on/off. Changing those button does NOT turn off the blower. I reset the furnace switch and turn it back on and watch
- draft inducer starts running
- I see the glow inside the window
- Now I see the burner flame light up
- in 15-30 seconds, I see my night light turns on and then I hear the main blower coming on along with the electrostatic filter indicator light
- I have heat now for next 12-24 hours
- One morning, heat is again at room temperature. I reset the switch. See the glow inside the window and see the burner flame light up for couple of seconds and immediately shuts off. At that time I noticed that the on-demand water heater (just installed about a month ago) was supplying hot water for the shower use upstairs. Couple of resets while the shower was going did not work for the furnace. Once the hot water was not providing the water, the furnace stayed lit. At that time, I was convinced that I have some gas pressure problems and put a call back to the plumber who had installed my on-demand water heater. I just assumed that when water heater was running AND then furnace needed to *fire up*, it had trouble but if it were already running, it kept running.
- I had the plumber come in and I tried to simulate the fault by having the shower turned on and asking the furnace to come on. The furnace fired up fine. Plumber opened up the furnace cover (he is NOT in the HVAC business) and noticed funny sound from that "draft inducer". He also showed me water drops coming under the inducer (motor/blower) assembly and the connection where it hooked up to the exhaust pipe and suggested to call for service. "May be the drain is clogged", so I removed the tube connected to the inducer and forced air through it. I don't think I noticed any restriction.
- after removing the bottom furnace cover we noticed some of the dripping water was coming down to the connectors and circuit board area and on the floor. The plumber says "may be you cleared the block; watch for next day or two and see if you are having still problems and if so call the service"
- Any DiOxit spray recommendation on the connectors that I see could have had water droplet?
- There is obvious "add drop of oil here" type of hole on the draft inducer motor and I am not even sure I want to even do that.
This is Trane XE90 furnace. As you can figure out, I have no idea what are the technical terms for the doodas which are in the typical hot air furnace but Emmet seems to know his stuff and I and am hoping he will give me some clues before I throw in the towel and call for service. But with the intermittent and non-reproducible problem, I need to be able determine the failing part myself. I would not change it myself but at least would know that if they replace it, at least it will stay fixed.
I was going to start a new topic last week myself. Sorry if I hijacked OP's! I have got much thicker skin, so go ahead and go at it.