Forum Discussion
Old-Biscuit
Sep 20, 2020Explorer III
maxum1989 wrote:
So I checked the ECO and thermostat for continuity. Seems as good. I took off the two wires, checked continuity through the ECO from one side to the other. Then did the same to the thermostat and then had continuity from top ECO to the thermostat. So am I correct to assume the board is the only thing left to check? Is there anything that can be done to the board to check it?
Check actual DC Voltage from On/Off Switch to the set of t-stats (DC goes to HI Temp (Top) first then thru connecting wire to Normal Temp (bottom)
Got 12VDC at RED wire on Bottom t-stats then check that you are getting 12VDC on RED wire at circuit board
If Normal T-stat is closed (water temp below 100*F) and you have 12VDC on RED wire at circuit board then you should have 12VDC on BROWN Wire from circuit board to GAS Valve solenoids and Spark Electrode should be FIRING (Get DC Voltage at same time)
Got DC TO circuit board but No DC from circuit board on BROWN Wire....bad board OR lousy GROUNDS (Inside DC Junction Box, Yellow wire from circuit board, Gas Valve solenoids)
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