I have a munchkin boiler with two of the sensors on the top left of the unit (cover removed) that have been leaking. I think one is a thermistor and the other is a flow sensor. Is it OK to use a wrench to tighten them to stop the leak or should I replace them. The leak appears to be where they are threaded in but I'm not sure. Also there is an F02 error code which is a thermistor. Not sure which one,there are two thermistors. Also the boiler is not working now. I assume the error code is preventing it from working. Any help is greatly apprreciated.
Larry