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What does E7 mean?

I was in the shower with hot water, the water turned cold and when I looked at the boiler it was flashing E7
Kimberly, March 2017
home Fix label Heating label_important Home Heating Systemsdone
Depends on the make and model of the boiler.

ONce you have that, you could do a Google search for - say - "make model E7" (replacing "make" and "model" with your own info, naturally :-) ) and see what comes up.

Not a psychic, March 2017

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