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Does this model do the tightness tests also?
Mine countdown to 5 and starts over. Can you tell me why it does that?
Show us how to use it on an older furnace natural draft, and then go through it and tell us what to look for, and then show us how to use it on a 90 percenter furnace
Testo 310 e7
Does this model do the tightness tests also?
Mine countdown to 5 and starts over. Can you tell me why it does that?
Show us how to use it on an older furnace natural draft, and then go through it and tell us what to look for, and then show us how to use it on a 90 percenter furnace
Testo 310 e7