Question

question 37 1 pts backup heat problems on heat pumps include all of the following except the back - up heat doesnt operate although the thermostat is calling for it to operate the back - up heat operates constantly the back - up heat operates every time the heat pump operates and the outdoor temperature is 45°f the back - up heat cant warm the house when the heat pump is locked out the back - up heat is controlled by the second stage of a two - stage thermostat

Explanation:

The other options describe common backup heat problems like non - operation when called for, constant operation, operation with heat pump, or inability to warm the house. Being controlled by a thermostat stage is a normal function, not a problem.

Answer:

The back - up heat is controlled by the second stage of a two - stage thermostat.