- Home
- For the homeowner
- Safety
- Definitions
- Gas furnace
- Some error codes for gas furnaces
- Service sheet for the gas furnace
- gas furnace design
- The gas heat exchanger
- Dangerous conditions in gas furnaces
- Annual service of the gas furnace
- Repair procedures for gas furnaces
- Gas fireplace millivolt systems
- Oil furnace
- Setting gas input
- Quick tips for troubleshooting furnaces
- Troubleshoot
- Operation and troubleshoot furnace by manufacturer
- HVAC war stories blog
- Annual service of an oil furnace
- Oil furnace design
- Oil furnace troubleshoot
- Repair procedures for oil furnaces
- Gas code training
- Piping and connections
- FAG w pilot no fire
- Combustion analysis
- Electric furnace
- Air conditioner
- Refrigeration
- Heat Pump
- Boiler
- Ductwork design and troubleshoot
- Thermostats
- Diagnostic problems
- Tools
- Electric test meters
- Electrical diagram training
- Electrical symbols
- Single and 3 phase power systems
- Electric wiring solutions
- Transformer design and troubleshoot
- Electronic air cleaner
- Blowers and fans design & troubleshoot
- Humidity and humidifiers
- Furnace, Air Conditioner and part manuals
- Electric motors
- Run Capacitors
- Start capacitors
- Troubleshooting the capacitor
- Gas furnace short cycling
Thermocouple replacement
Pilot assy with thermocouple at bottom
This assembly should be located near the main burners.
It may be mounted to one of the burners.
When it is removed, it is a good idea to clean the pilot burner.
When the pilot assembly is removed, the heat exchanger should be checked for cracks. Safety
Remove all burners and check the inside of the heat exchanger with a flashlight.
It may be mounted to one of the burners.
When it is removed, it is a good idea to clean the pilot burner.
When the pilot assembly is removed, the heat exchanger should be checked for cracks. Safety
Remove all burners and check the inside of the heat exchanger with a flashlight.
Cleaning the pilot orifice
This is the pilot assembly disassembled. Pilot tube lower right.
The cylindrical object on the lower right is the pilot orifice.
It fits on the end of the pilot tube.
The hole in it is extremely small. Too small to clean.
Simply wipe off the end and blow through it.
If it does not clear (you should be able to see light through it) replacement is about the only option. You will probably need to buy the entire pilot assembly.
The cylindrical object on the lower right is the pilot orifice.
It fits on the end of the pilot tube.
The hole in it is extremely small. Too small to clean.
Simply wipe off the end and blow through it.
If it does not clear (you should be able to see light through it) replacement is about the only option. You will probably need to buy the entire pilot assembly.
Thermocouple
This is the end that is heated by the pilot flame.
The 2 dissimilar metals inside will produce a small current when heated.
The 2 dissimilar metals inside will produce a small current when heated.
.
This end screws into the combination gas valve.
Careful, it is easy to cross thread this during replacement.
This end should be clean (clean with rag, nothing abrasive) and tight but not excessively.
When tightened, there is an electrical connection between the thermocouple and the combination gas valve.
back
Careful, it is easy to cross thread this during replacement.
This end should be clean (clean with rag, nothing abrasive) and tight but not excessively.
When tightened, there is an electrical connection between the thermocouple and the combination gas valve.
back