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System 2000 runs for a minute, shuts off stays off for a couple minutes and then runs for a minute
My System 2000 is quiet but for the last year or more it short cycles. I live in a duplex with two separate zone valves, Honeywell ditigal. I have had two local boiler guys look at the problem. The guy suggest staggering the time the thermostats come on. The other guy didn’t know what to do. So the problem still exist. Once both sides of the duplex quit calling for heat the furnace stops. Bypassed the system manager with a green card but didn’t solve the problem. Installed new fuel pump still cycles. Checked both thermostats to see if they worked separately all good. Both turned off the furnace when I set the thermostat to stop calling for heat. The greatest fraustration the guy who installed at least 10 years ago retired and have not found someone to help with the problem. Any advice would be greatly appreciated.