The second part of the number is how far the temp must fall before the limit automatically resets.
A 280F-20F waits until the temperature drops to 260F being closing and permitting the burners to come on again.
First off, the limit shouldn't go bad - it was probably tripping regularly due to an overheating condition, assuming it's high limit only.
Secondly, use a direct fit replacement, ideally oem approved. Don't modify the wrong part, as doing so voids the safety certifications.
The switch must have the same ratings as the original, it's not okay to put a higher rated switch like the tech did.
It sounds like u were recommended/shipped the wrong part.
A 280F-20F waits until the temperature drops to 260F being closing and permitting the burners to come on again.
First off, the limit shouldn't go bad - it was probably tripping regularly due to an overheating condition, assuming it's high limit only.
Secondly, use a direct fit replacement, ideally oem approved. Don't modify the wrong part, as doing so voids the safety certifications.
The switch must have the same ratings as the original, it's not okay to put a higher rated switch like the tech did.
It sounds like u were recommended/shipped the wrong part.
