Original message
| lth
 |  "Keeprite DC90 - High Limit Switch Bypassed"
, posted Fri 17 Oct 13:21  
My furnace would not start in March of 2008. I called a technician, he came out and he said the high limit switch was gone. He did not have a part. He bypassed the high limit and said a someone would contact me to replace it.
I called in Sept 2008. The company apologized, said thei never should have happened and sent someone out with the part. They replaced the high limit switch and 'red tagged' the furnce. They said the heat exchanger was gone and need to be replaced.
What is the purpose of the high limit switch? I live in Canada. March and April were very cold months and the furnace ran around the clock. Would by passing the high limit switch reduce the life of the heat exchanger? The furnace is 7 years old. Keeprite has a 30 year warrenty on heat exchangers.
The serice company, a large organization, is not taking any responsibility.
Thanks for the help!
LTH
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Replies:
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| Schock Therapy
| "Re(1):Keeprite DC90 - High Limit Switch Bypas" , posted Fri 17 Oct 23:16
The technician should NEVER have bypassed the high limit. It is a safety control that is designed to prevent the heat exchanger from getting too hot. If the fan fails, or airflow is restricted for any other reason, the burners could run continuously until the heat exchanger gets red hot. Worst case scenario, it could have caused a fire. That technician could lose his license for doing something like that. (assuming he had a license to lose!)
The heat exchanger could have been damaged by running too hot, but good luck getting the company to admit responsibility! You could argue that the HX was fine when the first technician worked on it. (See if the first work order mentioned checking the heat exchanger...it is a standard thing to check when servicing a furnace)Tell them that at the very least they should at least cut you a deal on the new heat exchanger installation. You could also threaten to report the actions of the technician to the local gas safety authority. (Was he even qualified to be working on a gas appliance?)
It's only a shock if your not expecting it!
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