4.8 out of 5 stars 419. A water heater according to claim 1, further comprising a burner rack coupled to the combustion chamber, the thermal switch being mounted to the burner rack. A three-way valve is installed on both the hot and cold water lines. The main automatic control unit failed and I'm currently unable to get a new unit for at least a couple days. If your water heater has a thermal reset switch, flip it. It looks brand new (and is newer than the heater itself anyway---that's another story). To reset the temperature limiting control: Electric supply may be off. I have a Bradford White Gas water heater model: MI40T6FBN4. My water heater is an American Water Heater Proline model and doesn't have that thermal switch, at least I can't find it if there is one. 3 Reset the thermal switch or button on your water heater. Could this be a faulty thermal switch or could there have been a vapor incident that permanently trips the switch? Which means OUCH-OUCH!We now have a new expression, STATE CAPTURE. I took out the pressure switch and inspected and cleaned it out. Redneck Texan. Frequent pilot outages or a tripped thermal switch often means the water heater is not getting enough air for proper combustion. Electric Water Heaters – Rheem Heating, Cooling And Water … Installing the water heater. The Pressure Switch on a hot tub or spa is a pressure sensor that is mounted onto the heater housing, or very close to the exit point of the heater. Alibaba.com offers 1,158 water heater thermal switch products. I believe it was manufactured around 2004, but not certain. I would really want to know why the switch failed twice, and running the unit without all safety devices seems like a bad plan. Side note: the reset button is also sometimes referred to as the ECO (emergency cut off) switch or “high limit safety thermostat switch”. The thermal bypass valve connects the hot and the cold line together to complete the recirculation loop. Skip to the end of the images gallery About 1% of these are Wall Switches, 1% are Flow Switches, and 0% are Remote Control Switches. In this final article, I’ll cover temperature sensors, erratic combustion and thermal switches. The earlier post is here: [www.plbg.com] I followed most of the advice in that thread, but still having the problem. Turn the heater onto its face or set it on a table once completely cool. In the picture below you can see a red button just below the text. However the switch has an indicator light, and has 3 wires running to it, so I'm unsure which wires to solder together to bypass the switch. The thermal switch on my Dometic (formerly Atwood) water heater had fused or burnt out, as you can see in the photo. 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