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Water Heater - Thermal Cutoff Switch | Repair and Replace - YouTube
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[Music]
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hi I'm Vance and welcome to repair and
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replace if the pilot light in your water
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heater keeps on going out or won't stay
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lit and it could be a problem with the
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thermal cutoff switch in this episode
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I'll show you how to test and replace
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the thermal switch in a standing pilot
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water heater
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standing pilot water heaters use a pilot
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flame that burns continuously and will
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ignite the main burner whenever heat is
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needed
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next to the pilot is the thermocouple or
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thermo-pile which generates a small
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electrical current when heated by the
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pilot flame this produces less voltage
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than a double-a battery but enough to
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power the gas valve
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starting in 2003 all gas water heaters
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are installed with a sealed combustion
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chamber and a flammable vapor ignition
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resistant device or FV IR this protects
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against overheating and the uncontrolled
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combustion of paint fumes gasoline and
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other flammable vapors in a standing
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pilot water heater this device is a
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thermal cutoff switch or TCO if the
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temperature in the combustion chamber
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gets too high in the switch will trip
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and cut power to the valve additionally
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if the switch is faulty then will also
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prevent the pilot from staying lit to
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begin you'll need a multimeter and a
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screw driver or nut driver
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always be smart when working with gas if
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you notice a strong gas odor at any
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point then shut off the gas ventilate
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the area and immediately call a
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technician
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first turn off the gas supply the handle
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should be perpendicular to the pipe
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the bottom cover
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set the thermostat control to the pilot
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position
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set the control valve to the off
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position
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if the thermal switch has a button then
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it's likely resettable simply press the
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button to reset the switch
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Thermal switches have a reset button
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some will reset automatically and some
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water heaters will use a one time fuse
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regardless you can test the switch for
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continuity to see if a continuous
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electrical signal can pass through it
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first set the multimeter to the ohms
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setting
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disconnect the wires to the switch
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place the probes on the terminals
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multimeter reads Oh L or open-loop then
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there's no continuity and a switch
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should be replaced
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now if the switch has continuity that
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it's best to test the thermocouple or
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thermal pile you can see more in the
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videos linked in the description
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you
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first unscrew and remove the thermal
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switch
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align the new switch
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and tighten the screws
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now reconnect the wires
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first turn on the gas
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to the water heater
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now we like the pilot
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now set the gas control to the on
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position
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next set the control to the desired heat
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setting
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the main burner should fire up
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finally replace the door cover
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helped you get your water heater working
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again for more troubleshooting on water
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heaters furnaces and appliances then
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subscribe to our Channel and if you need
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help you can call or visit a name or
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location to talk with our knowledgeable
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staff thanks for watching
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you
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you
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