It's been a long time since I thought about this. I was having an issue recently that I think was probably just water in an igniter (overflow or from a pot put back on the stove to dry after cleaning). I'd been meaning to check back and remind myself what I did and maybe update if I change something out. I did notice that the screws attaching the igniters were pretty corroded. That may have been a bad material choice on my part. My quick and dirty troubleshooting would be to trade igniters from a working burner to a nonworking burner to decide between module and igniter. If the same burner still doesn't work, you might also check out the wiring to see if it's been pinched or otherwise has a problem. That's my mute-the-work-conference-call-and-type-real-quick response.

I am not an expert for your setup, but I will offer some comments. I have never heard the Trane warranty will be voided if you don't use their thermostat. The Honeywell Vision Pro thermostats are used frequently with Trane equipment. Call Trane if you want to get an answer on this. I assume you have a thermostat for the boiler? Then my suggestions is to lock out the two heat pumps and the boiler at a set temperature. For example if you determine you want the set point to be 35 degrees, the two heat pumps would be locked below this temparature, and the boiler would be locked out above this temperature. You would need thermostats which have an outside temperature senser. I am not sure if the Trane TCONT803 has this feature. Others on this forum can comment on this.

Thanks for the comments tigerdunes. We've been over this quite a bit already. The pricing is average for the North East....labor rates tend to be quite high and the $600 rebate makes the price of the furnaces excellent. I obviously have two stage thermostats and the sizes of the furnaces were decided after heat loss calculations. I live in an older home in a cold climate and my calculations were within 10% of my contractor's. The calculation for my two floor unit came in at 75kBTUs. The contractor initially wanted to install a 100kBTU unit, but I talked him down to 80kBTU. The furnace for the renters below me is a bit large, but it was the smallest two stage available from American Standard. I thought about installing a 92% efficient 40kBTU single stage furnace with selectable motor speed, but as the 60kBTU two stage with variable speed motor was the same price after the rebate I went with that one.so that both furnaces essentially the same and to get the variable speed blower. I imagine having the second stage will also be nice on very cold mornings.

Quote: My experience is that the effect of warm air rising and cold air sinking tends to mess with the effect of the multiple zones. In the summer time the upstairs thermostat calls for cooling while the downstairs thermostat does not but because the cold air sinks the basement and first floor stay cooler than the second floor. End Quote. It will to one degree or another, however a zone system is designed to 'minimize' this problem by controls that direct the cooling or heating to where you want it. Naturally the upper levels of the home will call for cooling more frequently than lower levels. Zoning isn't entirely perfect, in many cases it depends on the home layout. If you have a home that is more 'open' you will get bleed thru from one zone to another. But what difference does it make if you have better control? Assuming of course the zone system is installed properly... many times they are not. The best control of a zone is a zone in which there are 4 walls and a door and preferably there is a return as well as supply duct(s) within that zone. On a multiple level home that is zoned the equation changes some what in that each level of the home is typically a zone. Sure the bottom levels of the home will be cooler than the top level (second floor). The idea in zoning the AC to the basement is to 'limit' the amount of cooling it receives... otherwise the complaint is always the 1st level is too warm and the basement is too cool. Zoning is merely to give you better control and reduce complaints. The other thing that you may not realize is that zoning has the capability to cool one area while heating another area. Not at the same time of course with one HVAC system, but it can vary the cycles. It's all about comfort and control when it comes to zoning. (Think of a yuppie 3 level home with only 1 HVAC system.) Without zoning can you imagine the fights of the lower level of a 3 story home with 1 HVAC system in fall and spring seasons with someone who is on the 3rd level? Savings can be achieved by only cooling or heating areas of the home that need it.