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Lochinvar Knight KBN106, No 24 Voltage to Low Voltage Board
I have no 24v low voltage to Low Voltage Board (causing a Gas Pressure Switch Fault & Lock). I have replaced both boards, the main board twice, believing the first must have been defective. Wiring connections have been checked thoroughly numerous times. On recommendation of an online Lochinvar tech, I've also replaced the fan. I have 120v at the main board, but no 24v coming out at the output connector. I bypassed the main board and supplied 24v directly to the low voltage board. By doing this, the furnace doesn't lock out until it wants to fire and then locks out, because of course, I have shut off the natural gas since other monitoring systems are not receiving voltage. With voltage into the main board, but no low voltage coming out, are there other possibilities besides main board? Thanks for any feedback!