Far and away the best explenation of the defrost board function. Detailed, concise and easy to follow. New tech here (8mo.), I've watched 5 or 6 videos on this topic and I keep coming back to this video. Thanks for the lesson.
@samyz1660 Жыл бұрын
Great great video. It was easy to follow and soak up the infos . Thx .
@dwainbailey6755 Жыл бұрын
Really good video ❤❤🎉
@LuisRojas-uu4om2 жыл бұрын
Best explaination of how the defrost board works and how to check the defrost board . The only thing that was not verified was that the electric heat came on when defrost kicked in
@tyl8ter3 жыл бұрын
The best explanation I have ever seen...Right on!
@TFlowin1553 жыл бұрын
I’ve been looking for a video like this good explanation loud and clear nice vid thanks!
@mario83ortiz3 жыл бұрын
Exactly what I was looking for thank you
@salvatoremagarelli44914 жыл бұрын
Excellent Detailed Explanation
@barrellcooper64904 жыл бұрын
Thumbs up. Great video.
@kdlgutterinstallation66754 жыл бұрын
Okay, I have a question. To check all you have to do is disconnect the fan and force the unit to run in defrost mode; then reconnect the fan to check the fan relay, and if the fan comes on and you have 24 volts the unit is in good condition?
@MaMa-qh4dy3 жыл бұрын
Before I condemn the defrost board part number Trane CNT 02941. Split unit heat pump. Two defrost temp. sensors (ambient and coil). Defrost is auto "demand". Condenser ices-up. I short out force-defrost pins, unit enters defrost mode, OD fan cuts out, but ONLY 5VAC to reversing valve. Should be 24VAC in order to switch-over refrigerant direction. Reversing valve coil Ohm checks good. Both sets of sensor pins on defrost board show proper voltage at 5.5VDC. Both outdoor temp. sensors ohm out good relative to outdoor ambient temp. LED flashing normal. I had to melt the ice by shorting out force-defrost pins and temporarily jumpering R-O wires at condenser which sends 24VAC directly through defrost board to activate reversing valve. So, reversing valve is not automatically receiving proper voltage during defrost cycle. Any suggestions for other tests prior to condemning defrost board? Thanks.
@BinhGu Жыл бұрын
can I do it in cooling mode?
@uPshiftsHaun3 жыл бұрын
I have a goodman GSH130301AC. The fan runs during defrost, is that normal for this model? Or is my board bad?
@irongoose3865
3 жыл бұрын
Mine does the same thing and it's a Goodman. My unit is working and with that said tonight I noticed at the air-handler I couldn't feel or hear any coolant flowing and both lines where cold. So I went out to the outside unit and it was running and I noticed ice on the coils. They weren't completely iced up but there was ice. So I went back inside and a little while later I heard the noise the outside units make when they go into defrost. Back outside I go and I notice wet spots all around the outside unit which tells me it's defrosting. When I get back inside I can hear coolant flow and both lines into the air-handler are much colder then before! Some time later I start feeling heat in the house so I go over to the air handler and touch the lines again and the larger line so warm but I don't hear or feel coolant flow in either line. Now during the summer time I hear coolant flow anytime the A/C is running. I hope that helps.
@scottbishop25324 жыл бұрын
You should be an Instructor if you are not already. Most Instructors fumble around when explaining this at local Community Colleges for whatever reason; when the Instructor is doing this the Student is then lost somewhere along the way and even if the Student understands the concept he/she may not be able to perform these checks when in a truck on their own. Hence the jumping of the defrost thermostat that you are seeing a lot.
Пікірлер: 15
Far and away the best explenation of the defrost board function. Detailed, concise and easy to follow. New tech here (8mo.), I've watched 5 or 6 videos on this topic and I keep coming back to this video. Thanks for the lesson.
Great great video. It was easy to follow and soak up the infos . Thx .
Really good video ❤❤🎉
Best explaination of how the defrost board works and how to check the defrost board . The only thing that was not verified was that the electric heat came on when defrost kicked in
The best explanation I have ever seen...Right on!
I’ve been looking for a video like this good explanation loud and clear nice vid thanks!
Exactly what I was looking for thank you
Excellent Detailed Explanation
Thumbs up. Great video.
Okay, I have a question. To check all you have to do is disconnect the fan and force the unit to run in defrost mode; then reconnect the fan to check the fan relay, and if the fan comes on and you have 24 volts the unit is in good condition?
Before I condemn the defrost board part number Trane CNT 02941. Split unit heat pump. Two defrost temp. sensors (ambient and coil). Defrost is auto "demand". Condenser ices-up. I short out force-defrost pins, unit enters defrost mode, OD fan cuts out, but ONLY 5VAC to reversing valve. Should be 24VAC in order to switch-over refrigerant direction. Reversing valve coil Ohm checks good. Both sets of sensor pins on defrost board show proper voltage at 5.5VDC. Both outdoor temp. sensors ohm out good relative to outdoor ambient temp. LED flashing normal. I had to melt the ice by shorting out force-defrost pins and temporarily jumpering R-O wires at condenser which sends 24VAC directly through defrost board to activate reversing valve. So, reversing valve is not automatically receiving proper voltage during defrost cycle. Any suggestions for other tests prior to condemning defrost board? Thanks.
can I do it in cooling mode?
I have a goodman GSH130301AC. The fan runs during defrost, is that normal for this model? Or is my board bad?
@irongoose3865
3 жыл бұрын
Mine does the same thing and it's a Goodman. My unit is working and with that said tonight I noticed at the air-handler I couldn't feel or hear any coolant flowing and both lines where cold. So I went out to the outside unit and it was running and I noticed ice on the coils. They weren't completely iced up but there was ice. So I went back inside and a little while later I heard the noise the outside units make when they go into defrost. Back outside I go and I notice wet spots all around the outside unit which tells me it's defrosting. When I get back inside I can hear coolant flow and both lines into the air-handler are much colder then before! Some time later I start feeling heat in the house so I go over to the air handler and touch the lines again and the larger line so warm but I don't hear or feel coolant flow in either line. Now during the summer time I hear coolant flow anytime the A/C is running. I hope that helps.
You should be an Instructor if you are not already. Most Instructors fumble around when explaining this at local Community Colleges for whatever reason; when the Instructor is doing this the Student is then lost somewhere along the way and even if the Student understands the concept he/she may not be able to perform these checks when in a truck on their own. Hence the jumping of the defrost thermostat that you are seeing a lot.