Plumbing Questions? Ask a Plumbing Expert.
Hello, we need to do a few tests.
Turn another hot tap on while you are taking the shower, and run the shower at higher than normal water flow during the shower... if that solves the problem, then then there is probably excessive water scale build up in the water heaters heat exchanger and it will need to be cleaned.
I need the brand and full model number of the water heater as well.
Let me know, we can go from there.
see pages 13 and 14 tell me if any of those error codes are showing up.
Let me know to what degree you think such a diagnosis fits your skill sets, we can go from there.