West Hill Tom· Registered
Hi there, I'm new to this group so thanks in advance for any help you can provide. I'm trying to trouble shoot a York Diamond 80 that starts, ignitor starts, and then when flames kick on, it shuts off. It should be the flame sensor, right? I've replaced that but the problem persists. The issue when it occurs, is mostly after the furnace has sat for a period of time (like overnight when the thermostat is turned down). Most of the time when it happens, as soon as it shuts off, the furnace comes on again and usually works the second time. Lately, though, when it shuts off, it doesn't come back on at all unless I physically turn the switch on the thermostat off, then turn it back on. I've done a lot of looking online but can't seem to find this same problem. Any ideas? Many thanks!