I've noticed two problems with my heating system, but not sure if they are related. Here's the background - sorry for being so long winded.
I have a Weil-Mclain Gold CGi Series 2 (which was probably installed in the 2002/2003 time frame). I have four zones:
Zone 1 - main floor
Zone 2 - upstairs (bedrooms)
Zone 3 - indirect water heater
Zone4 - radiant floor in the kitchen
I also use Honeywell programmable thermostats for zones 1 and 2, and a manual thermostat for zone 4.
At night, the temperature for zone 1 (downstairs) is programmed to drop from 66 to 62 and zone 2 is set for 66.
On at least 3 or 4 occasions now in the last month, right before bed, I do a final check and have noticed zone 2 (upstairs) drop to as low as 63 (about 1 degree higher than downstairs), even though it is set for 66. My guess is that it is no longer switching on, but the downstairs heat is rising and keeping it at 63. Switching the thermostat from heat to off and then back to heat again seems to reset it and all seems to work fine for the rest of the night - with one exception...
Again, not sure if this is related or not, but since my bedroom is above the furnace room, I can hear the furnace blower when it turns on, and several times now, I've heard it cycle on for about 10 or 15 seconds, then off, then on. It does this 3 or 4 times before finally cycling on and staying on for several minutes. The following morning, when zone 1 starts requesting heat, I don't notice this cycling problem anymore.
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