When troubleshooting a residential heating system, the technician reads 24 volts at the gas valve on a call for heat, but the gas valve does not energize. What would be the most likely problem?
A) defective gas valve
B) defective thermostat
C) defective transformer
D) blown low-voltage fuse

Question

Quizplus · Accepted Answer

The most likely problem is a defective gas valve. If the technician reads 24 volts at the gas valve during a call for heat, it indicates that the control circuit is functioning correctly up to that point, including the thermostat, transformer, and any low-voltage fuses. The presence of the correct voltage at the gas valve without it energizing suggests that the valve itself is faulty.

When Troubleshooting a Residential Heating System, the Technician Reads 24