What are the symptoms of a bad reversing valve?
If the valve sticks, it will not change from the heating to the cooling position or vice versa.A defective solenoid coil will not energize the valve in the cooling mode.
What causes a heat pump reverser valve to stick?
The most common reason for a reversing valve getting stuck is due to a bad solenoid. The solenoid is responsible for switching the process from heating to cooling and vice versa. A broken solenoid is not going to be able to switch from one mode to the other, essentially causing your reversing valve to get stuck.
Can a stuck reversing valve cause high head pressure?
This is a bypass from the liquid system to the low side and will also cause high back and low head pressures. A liquid bypass could be caused by a stuck- open expansion valve, leaky check valve, or an oversized or poorly seated fixed orifice.
How much does it cost to replace a reversing valve on a heat pump?
If your heat pump is blowing cool air, you need to get your reversing valve replaced. Expect to pay between $450 and $600 to get a malfunctioning reversing valve replaced.
What controls the reversing valve?
A reversing valve operates by a pressure difference inside a metal tube, controlled by a solenoid. The pressure change moves a slider through the tube, and this slide straddles two of three tube openings.
What does a reversing valve do?
In a heat pump, a reversing valve controls the direction of the flow of refrigerant. Refrigerant is the chemical mixture that allows for the heat exchange to occur.
What does a bad reversing valve sound like?
Sometimes customers complain of a “buzzing” noise coming from the outdoor unit, even when it’s not running. This is usually caused by the reversing valve solenoid coil. It’s usually a low voltage device (24 volts) and some are just louder than others – and in most cases, this is normal.
What causes high head pressure in heat mode?
Restricted airflow/a dirty coil will cause high head pressure, the same way that a dirty outdoor coil will cause high head pressure in cooling mode. Be sure to also check filters and make sure that register grilles have not been closed off in certain rooms.
Why does my heat pump cool but not heat?
If your heat pump is low on refrigerant, it will fail to meet cooling or heat demand. The most common cause of this is a leak. A technician can diagnose the problem, repair any leaks, and re-charge the system if necessary.
