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white rodgers zone valves
I have a customer with three white Rodgers zone valves, first floor, second floor, and indirect hot water heater. The first floor valve would not shut down a previous contractor replaced that valve, that did not fix the issue than they changed the thermostat that did not fix the issue either. currently I am at a bit of a loss as to what the issue is. I was thinking possibly the thermostat wire could have a short in it but when I was at the house all was working fine so I couldn't test that. the customer says when the valve wont shut down they turn the wheel and this keeps the boiler off until the next time the thermostat calls for heat. Which doesn't back up my thought of a short in the thermostat wire since the valve would just reopen. I was also wondering if possibly the transformer wasn't strong enough to turn the valve but it worked fine for 20 years. any thoughts would be appreciated.