Anyone have a list of access codes to “unlock” T-Stats for testing during a “new home final” inspection? IE: Builder has locked T-Stat to keep temp within certain range so am unable to complete HVAC testing. Builder also not available during inspection.
There is bound to be a collection of access codes for each of the many T-Stats out there?
There are dip switches on the back of the stat. Instructions should be available.
We are not supposed to re-program electronic stats, so I just jump the stat at the unit.
Turn the fan switch to ON from AUTO.
Jump red to yellow for a/c, red to white for heat.
Red to yellow and orange for heat pump cooling.
Or, Red to yellow and blue if orange is not used (this configuration energizes the reversing valve for heating).
During new home construction the builder will usually have the T-Stats locked out so the trades can’t arbitrarily change mode/temp. There are generally bypass or common codes to get past the ‘lock-out’ so the units can be switched from heat to cool and adjust temperatures up/down.
Not sure that it is wise to use bypass jumpers, but may be worth a thought.
Actually, it is never wise to jump anything if you don’t know what your doing.
Charlie called me on that one! :-0
Call the contractor and have them unlock the stat!
Actually, the unit is still under the installers warranty and I really don’t care if I can’t test it. Just inspect the installation.
Many installing contractors get real pissed if you mess with their stuff! If it doesnt work on moving day or six months later when the weather changes, they are the one’s who will be called.