Temperature check water bout 105F might be element alkali build up inside tank , check thermostat on tank see what temp setting, could be faulty all parts about $ 30.00 on line happy trails
SOURCE: i can only get hot water when i turn the heating
It sounds like you have a bad aquastat, if you have steam heat, and you have closed off the radiators, it will not cause a problem, it will just shut off when you build a couple psi of pressure. I would not recommend the same on a hot water boiler, because it could cause problems if you start making steam. Hope this helps.
SOURCE: Code 11 01 - Hot Water Heater Kicks Off
if you have build up in the heat exchanger it will cause the unit to use more gas to heat your water, if the gas line isn't sized properly then your going to kick the error codes off. it sounds like you have two problems, first you have build up in your heat exchanger and it needs to be flushed and second you need to get a bigger gas line to it
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