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protherm 80e?

my heating is working ok,but i have no hot water either when heating is on or off.
should i change the diaphram or the thermistor.
thanks.
david parker, November 2008
you should be able to see if the diaphram is ok if it pushes out the pin to operate the d/h/w switch

arthur, November 2008
link Click here to see other fixes for Protherm 80e.