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Stupid question here but can't seem to figure this out.
Went to look at a nuisance call today. Former customer but I did not install or work on the system. Old(1972) weil Mclein gas fired hot water boiler. Did not see an old tankless on it. Has a high/low aquastat controlling boiler and zone 1. since then zones 2 and 3 have been added. zones 2 and 3 are single zon relays for each. all zones are baseboard. Complaint was that 2nd floor is heating all the time. Customer has shut off all t-stats as well as all switches on the boiler. no chance that pumps are running. Zone 1 is 1st floor, zone 2 is 2nd floor and zone 3 is basement. Upon arrival noticed that all tstats are off. second floor heat is migrating and all baseboard is hot. Figure a bad flow check. go to boiler room and see all switches in the off position, yet all supply pipes too hot to touch. second floor return pipe too hot to touch. basement and first floor returns are cold. figure bad flow checks. look at hi/low aqaustat and realize it is set for 180 hi and boiler is firing to 220. It is a millivolt system.
Am I dealing with a bad aquastat and three bad flow checks all at the same time? or am I missing something?