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1†pressure relief valve is periodically going off because boiler pressure is too high. When I arrived pressure was 28#. Made call for heat from both baseboard zones. Boiler pressure climbed to 40 psi. Pressure relief valve opened at this point. I took the call for heat away and relieved boiler pressure. Bled hydronic lines. After making call for heat the final time boiler pressure stabilized at 18 psi during a full cycle. Set differential on Honeywell Aquastat to 15. Boiler is operating well at the time of this service.