I bought it second handed. Each year I have trouble getting it started. Does a part need to be replaced for the heater to kick on if my pilot light is lit?
Could be pressure switch. that is the most common failure. otherwise, ensure gas pressure to unit, make sure gas valve switch is on (inside unit)
SOURCE: Pilot light on Dyna Glo gas heater won't stay lit
Cleaned pilot light area with an air compressor. Problem solved!
SOURCE: Propane patio heater ignition problem
I would change the thermocouple and here is why:
The thermocouple is the pilot's, well, co-pilot! It is the electronic device that senses if the pilot flame is hot enough to sustain burning the gas fuel from the burner. If the thermocouple thinks it's safe, then it keeps open the main gas valve located in the pilot assembly. If the thermocouple does not sense enough heat from the pilot flame (such as when the pilot is out), then the thermocouple shuts off the gas valve to the burners.
How the Thermocouple Works
So what is this thing and how does it work? Well the thermocouple (technically called a thermocouple junction) is a device that contains two metal wires welded at the ends and placed inside a protective metal case. The thermocouple sensor is found at the business end of the pilot flame and is designed to be placed in the hottest part of the flame. The other end is connected to the pilot valve body. As the thermocouple heats up, it produces a small amount of electricity and when it gets hot enough from the pilot, send a signal to open the gas valve by using a solenoid operated by a 24 volt transformer. The thermocouple calls the shots, and by converting heat to an electrical signal, it allows the gas valve to open or close.
Once the gas valve is open, gas is then constantly supplied to the pilot and as required for the gas burners (as called for by the thermostat). If the pilot goes out, then the thermocouple gets cold and produces no electric signal to open the gas valve's solenoid and the gas valve shuts off the gas supply to the pilot and burners
SOURCE: Pilot light is lit, but heater will not fire
Make sure thermostat is set higher than water temperature. Make sure pump is running and water is flowing through unit. If gas valve is not opening then flame sensor or gas valve is bad.
SOURCE: pilot will not stay lit after button release
most likely you have a thermopile that has low output. it takes about 100mv to maintain pilot light
SOURCE: Laars Lite 2 LG - pilot light will not stay lit.
It sounds like a thermocouple has gone bad. this is a very common problem with gas powered things ie; water heaters, furnaces, hot tubs. The telltale sign is when you release the pilot light button it won't stay lit. This is a safety feature and is relatively inexpensive and easy to repair.
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if the pilot is lit and the burners wont fire you have an issue in one of the following areas. one of your safeties are open....you have a bad electrical connection or electrical short............tstat control or potentiometer isnt working properly
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