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thanks for the response, the millinium board is setup for 2 stage and the modulating furnace control is setup for 3 modules, it does indeed have three modules and the mfc board is not faulting any...

your cracked heat exchanger is definitley the culprit, it causes the slower velocity of the combustion fumes and the flames have a harder time pulling thru properly, hence on a windy day they dont...

I have this york/johnson rtu M#v33ad54a5idaaloo1, when the heat is enabled from main board to the modulating furnace control (staging relay control board), the third-five cell heat module creates a...

I've got large cleaver brooks boilers piped in for lead lag and with a mixing valve for the secondary loop, both circ pumps run below 55deg, although when the right boiler runs on lead, the left...

ill check that out thanks

I recently had an issue where my trane ahu discharge air sensor reading at the front end was out of range (ten degrees below actual) despite an acceptable ohm value at a given temp (i checked it...