Heating, Air Conditioning, Fridge, HVAC/thermocouple replacement

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Question
furnace
furnace  
Hello,
No heat this morning, after several attempts to relit, I've come to the conclusion that the thermocouple went bad. I've changed several on water heaters before, so I am familiar with the process.
Furnace is a Coleman Presidential II #7680B.(photo attached)

My question is do I have to disconnect the gasline to get to the thermocouple? I've removed the mounting screws around the gas valve but the unit still won't move.
Any advice?
Thank you for the consideration.
Harv

Answer
Harv,

You got to remove the pilot line ( 1/4" aluminum tubing ) from the gas valve along with the thermocouple from the gas valve, then remove what looks like a access door/panel behind the gas valve, which the pilot assembly is mounted on. If you do not have a good pilot and it's not touching the top third of the thermocouple that also may be your problem

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40+ years diversified experience.An HVAC/Refrigeration Self Employed Contractor since 1986. NATE Certifield. Answer questions pertaining to Residential and Commercial Air Conditioning , Warm Air Heating, Heat Pump systems.Mechanical and Electrical troubleshooting of these systems.Be as detailed as possible when describing problem.Packaged unit or split systems.No appliance questions.

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Installation and Troubleshooting, Mechanical and Electrical, in following areas, Refrigeration ( Walk In and Reach In Coolers and Freezers ) Commercial Roof Top and Packaged Heating/Cooling ( Natural Gas,Propane, Electric, and Heat Pumps ) Computer Room Air Conditoning Systems,Commercial Residential Packaged and Split Systems Air Conditoning and Heat Pumps.Warm Air Oil , Natural and Propane Gas Heating systems.

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Graduated from Private Technical School in 1975. An HVAC/Refrigeration Contractor . Have Unlimited Heating/Piping and Cooling Contractor License.Limited Sheetmetal Contractors License.NATE Certifield. York Certifield Master Heat Pump Technician 1986. Served 33 years combination Active Duty Air Force , Air Force Reserves and Air National Guard in the HVAC/Refrigeration Shop/Mechanical Shop. Troubleshooting/Installing HVAC/Refrigeration Equiptment Worldwide. Retiring in 2003 as a Senior NCO ,and a Mechanical Superintendent.

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