Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Mysterious Short Cycling--T-stats end call for heat after 5 minutes firing; then boiler starts again
Needless to say very frustrated at this. Peerless MI-03 with Turbomax indirect. DHW is fine. DId a heat test all three zones ten days ago everything heated up fine. Now tonight two zones called for heat and in both cases t-stats shut down after five minutes. We never had any anticipator issues before--usually when room temp was about to drop just below setpoint, boiler would fire and stay on. I know this is a borderline season and temps on t-stats do reflect the target temp, but boiler is going on and off every five minutes. It's mostly one zone over and over again. Hydrostat does have the circulator hold off feature which seems to be working correctly. The T-stat in question is the White Rogers 1F78