Heat Pump Defrost Board Problem

The outside fan will not run.

Heat pump defrost board problem.

Verify that fc1 and fc2 fuses on fuse board are not open. The defrost board controls the defrost in the colder months. That is true for air conditioner troubleshooting heat pump troubleshooting or gas furnace troubleshooting. A circuit board in the most common system works off of input and output.

The heat pump should defrost regularly when the frosting occurs and should be long enough to melt all of the ice but short enough to avoid energy waste. Remove fc1 and fc2 fiises from fuseholder. In the winter heat pump icing up is often perfectly normal. Using multimeter i have determined that the nc relay on the dfc board is open.

Clicking noise heard inside. Haven t determined yet whether the relay is bad or something in the defrost control is calling for the fan to be. Check control transformer power 24v. The defrosting relays make the cycle occur every 30 min or so.

When heat pump is operating in defrost mode ice will thaw from around outdoor coil and water will flow from the unit. Start with the basics and work your way to the problem. Every so often the unit will go into defrost mode to remove. Amazing to have joined the board just in time to post the first question on the heat pump forum.

However there s a process in most heat pumps which fixes the iced up problem within the defrost mode. The heat pump condenser operates below the dew point and collecting frost and ice on the heat pump condenser coils. Heat pump problems defrost. Use the trane heat pump troubleshooting guides below.

Heat pump troubleshooting problem 1. No power 24v to board terminals r c or board failure. If power is available to board and led s do not light replace board. If you have problems with your trane heat pump don t rush to call for expensive master s help you can fix your device for free.

Of course depending on the issue will depend on where and what you look at with the system. I have an 18 yr old trane heat pump with a 21c140501 defrost control board. During the cold winter months your heat pump s outside unit will sometimes be covered with a coating of frost on the sides or even light ice.