Service & Troubleshooting第 92 / 110 题
When a heat pump is stuck in cooling on a heat call, which component is a prime suspect?
a.The condensate trap
b.The air filter
c.The reversing valve or its solenoid coil
d.The supply registers
解析
If a heat pump blows cold air on a heating call, the reversing valve may be stuck or its solenoid coil or control signal may have failed, leaving the system in cooling mode. The technician checks the coil, the control voltage, and valve operation. A stuck valve often requires replacement.
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