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Friedrich MR09Y3H Limit Switch
The main reason limit switches are made is because if the air is not warm enough then the house will never get warm enough. The limit switch is a type of sensor switch located in the furnace that determines if and when the air is warm enough for the main blower to kick in and circulate the air.
General warnings of an unhealthy main limit switch
- The HVAC system will not begin nor will it stay running like it is supposed to
- The whole system is starting to ramp up but then stops often
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If you are going to be buying or purchasing do your best and double check the model number and also make a visual inspection so that you are positive that the proper replacement limit switch is being ordered. HVAC pros may have higher labor rates than others so you could call around to acquire the best rate if money is of great importance to you.
Feel free to download your manual for help.
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