The Thermostat and Temp and Press Valve is faulty and needs to be replaced. or the PRV (pressure reducing valve) is dirty and must be replaced
Check into the temperature control valve--this is different than the thermostat.
To test a hot water heater thermostat, you can use a multimeter to check for continuity in the thermostat. First, turn off the power to the water heater. Then, remove the access panel to expose the thermostat. Use the multimeter to test the thermostat's terminals for continuity. If there is no continuity, the thermostat may be faulty and needs to be replaced.
The heater cor was replaced but it is still not getting warm
If a thermostat is not working properly, you cannot calibrate it. It must be replaced.
To test the thermostat on an electric water heater, you can use a multimeter to check for continuity and proper functioning. First, turn off the power to the water heater. Then, remove the access panel to expose the thermostat. Use the multimeter to test the thermostat's terminals for continuity. If there is no continuity, the thermostat may be faulty and need to be replaced.
Thermostat probably needs to be replaced.
Was the gasket replaced? Have you checked the hose and the heater core. Is everything tightened down?
heater core plugged or air locked check to see if hoses going to heater core are hot
Try flushing heater core Try flushing heater core
MY CAR WAS DOING THE SAME THING NO HOT AIR COMING OUT OF THE HEATER I CHANGED THE THERMOSTAT. IT WASNT THE THERMOSTAT. I GOT TO CHECKING AND THE SEAL IN THE WATER PUMP WAS BAD. I REPLACED THE WATER PUMP AND IT WORKS FINE NOW.
To test a water heater thermostat, you can use a multimeter to check for continuity and proper voltage. First, turn off the power to the water heater. Then, remove the access panel and insulation to expose the thermostat. Use the multimeter to test the thermostat's terminals for continuity and voltage. If there is no continuity or incorrect voltage readings, the thermostat may need to be replaced.