I have a basement laundry room with washer/dryer and utility sink.
I am receiving no hot water flow out of the valve for the washing machine. I have checked the hose from the wall to washer and it is clear, the screen inlet on the washing machine is clean. The wall valve appears to be opening and closing properly, no water flow, hot or not at all.
The machine has separate hot/cold water hookups and the cold water is flowing normally.
The utility sink next to the washer and dryer is operating normally both cold and hot water.
From what I can tell there is a PEX feed in the ceiling to that room which T's off behind the wall to feed the sink and washing machine. I only assume this because when running cold water into the washing machine and then turning on the utility sink, I see a slight fluctuation in pressure.
I attempted to run a hot water wash yesterday and received an error code of 4C, which is inadequate water feed. I reset the machine and tried again, I received a small amount of hot water that fell to a trickle and then stopped and halted the machine cycle. Cold water continued running normally to the machine.
I live in Maine, we had a colder night the previous evening but have had colder and never had any issues with no hot water to the washing machine. We have piping hot water to every other bathroom and faucet in the house....on demand propane hot water heater. Just nothing to the washing machine. I run a pellet stove in the basement at night and ran a space heater in the laundry room for good measure in case something was frozen but that did not help. Still no hot water or water flow at that valve.
It is an exterior wall, half underground. So behind the laundry room wall is foundation and then insulated and framed exterior wall on top.
Could it possibly be an air lock? Should I connect the cold feed to the hot feed and run cold water back into the hot line?