I recently bought a used tankless hot water heater and the controller board is completely dead no power up when power is applied the display board works however the main controller board does not work correctly at all the fuse is good
I bought a used replacement controller board that also had issues that I was able to fix and now the tankless water heater works correctly now
However I would like to know if I could figure what happened to this controller board if possible
Tomorrow I will take some better pictures of both side of both boards
The transformer has resistance on the primary and secondary sides the rectifier diodes test good with a meter I have not checked with power connected to the controller board because I would have to make a jig to be able to check if I am getting secondary power from the transformer
The power inputs are the white connector red wire ( L1 ) and a red connector the left pin which is black is
( L2 ) is the power pins for the controller board the right pin which yellow goes to the triac gate pin then other two pins on the triac go the power in and to the temperature limit switch and then to the heater element the other side of the goes to the other side of the power supply
I bought a used replacement controller board that also had issues that I was able to fix and now the tankless water heater works correctly now
However I would like to know if I could figure what happened to this controller board if possible
Tomorrow I will take some better pictures of both side of both boards
The transformer has resistance on the primary and secondary sides the rectifier diodes test good with a meter I have not checked with power connected to the controller board because I would have to make a jig to be able to check if I am getting secondary power from the transformer
The power inputs are the white connector red wire ( L1 ) and a red connector the left pin which is black is
( L2 ) is the power pins for the controller board the right pin which yellow goes to the triac gate pin then other two pins on the triac go the power in and to the temperature limit switch and then to the heater element the other side of the goes to the other side of the power supply
Comment