electrolux esl7220ro 911435301 09 no heat

[mikehha]

hi all I know what your thinking its a tacho on the motor thats stopping it heat, well not this time and its not the heater ? So has any one had a go at repairing the module on the back of this dishwasher. I take it to be a relay fault as I`m only getting 116v at the heater. any info or thoughts much appreciated.

[hebegebe]

I had this fault a while back, and went to the board before I knew the the tacho was the most likely cause. I changed one of the relays in an attempt to sort it before Dave put me right with the tacho advice. There were two relays controlling the heater, but switching L & N as I remember. If one were to fail it wouldn’t give 116v at the heater, but under no load conditions the 116v may just be a red herring being half of 230v. (Was that reading taken across the heater terminals? If so it implies some current flowing.) Further than that I can’t really help. The rear module was a devil to take out – wiring holding it tight – but beyond that it’s easy enough to access relays which were 12v as I recall.
Graham

[electrofix]

double check the tacho resistance with it unplugged and temp sensor before you jump on the board

Dave

[mikehha]

thanks all and yes dave tacho is 225 but will go back and check thermistor if ok will remove board.and have a play what have I got to loose thanks again mike

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