Remember Me? Results 1 to 11 of Thread: Ductless mini split keeps going into defrost cycles over and over. Thread Tools Show Printable Version. Ductless mini split keeps going into defrost cycles over and over Hello everyone.

I would like to thank anyone upfront for any insight you may be able to provide. The unit has worked well until recently. Two weeks ago when it was minus 13 celcius or 8 degrees F suddenly the indoor unit went into defrost cycle and would come out for about one minute blowing a small amount of warm air and then return to defrost cycle.

It would just repeat this over and over again with the house temperature dropping from our set point of 72 F to 65 F this took 4 hours. So I flipped our circuit breaker and turned the unit off waited 5 minutes and flipped the breaker back on and turned the unit back on and this seemed to "wake" the unit back up and it started to work again.

It even worked perfectly through a real cold snap where the temperature fell to minus 25 celcius or minus 13 F. Then on this past Sunday I woke up to the house cold again it was only minus 13 celcius The unit had once again returned to the repeated defrost cycle thing again.

mini split stuck in defrost

Couple of points: 1 There is no frost on the outside unit when this happens the Sharp THU comes equipped with a heating coil and large drain holes so there is nothing clogged 2 No snow covering the unit. I am asking the questions here more or less so that I have some insights so that I can ask educated questions. The technician I spoke with on the phone more or less said he had no explanation for this.

Any help? Either way following the manufacturers trouble shooting instructions will lead to the inevitable resolve of this situation. If the systems quits acting up as the outside temperature warms then that points more to a sensor being fooled. Thank you for that. I have my electric baseboards on now so the unit thermosters basically are reading that the inside temperature is warm enough so it's idle at the moment meaning I'm note sure if it would quit acting up if the outside temperature warms up I guess.

Question though: It is currently quite cold outside minus 15 celcius or 5 F so the HVAC company does not want to send a technician here to work on it in that sort of temperature so they will come out on Wednesday because the outside temperature is supposed to go up to 5 celcius or 41 F.

If this is a situation where the there is ice on the defrost trip sensor then would that be "diagnosable" if the outside temperature is high enough to melt the ice? So that the technician would look at the machine and not see anything? I just don't want to take a day off work only to have them come over and tell me that they could not find anything wrong.

mini split stuck in defrost

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mini split stuck in defrost

Quick Links View Forum Leaders. Thread Tools. Last night temps dropped to 20 F in FL and I found our heat-pump stuck in defrost mode in the morning emergency heat was on and it maintained inside about 68 F or so. I decided to reset the system after waiting for about 2 hrs. I shut off the circuit brakers for 10 minutes and restart the system again. It appears to be running normal now.

Heat Pump Stuck in Defrost Mode- PLEASE HELP

I would like to hear from members as to how I should be diagnosing this problem. I have an ohm-meter if you tell me a detailed procedure, I should be able to follow.

Mini Split Heat Pump - Winter Heating - Defrost Cycle, Energy Use, Costs (Fujitsu 9RLS3HY High Heat)

Your help is appreciated. Thank you. View Public Profile.Remember Me? Results 1 to 8 of 8. Thread Tools Show Printable Version. I just purchased a split mini system and hooked everything up. Works great in cooling mode but now i am switching over to heating season.

What's the installer have to say? What brand unit? It reads as if you installed the minisplit yourself.

How often should a mini split heat pump go into defrost mode?

You will probably need an experienced service tech to solve your problem. The way I understand the issue, it does not sound like it is in defrost. I hooked a vacuum pump up for an hour, took it off, opened the service valves and it was blowing cold just fine for weeks.

Maybe you should call the manufacturer and ask them. These knock off brands are disposable. When they break, you just throw them away and buy a new one. Customer service and warranty coverage are usually horrible.

You'd have to get technical information for that brand, for what the issue is and what's causing it. Sorry, this is not a DIY site. Thread closed. Contractor locator map How-to-apply-for-Professional How many times must one fix something before it is fixed? Please read this Valves, Regulators, Filters, Etc. Subscribe to this feed. People: December The Unsafe Superstar. Code Quiz of the Week: No.

All times are GMT The time now is PM. All rights reserved.We recently had a pump installed. We were told that it would go into defrost mode occasionally to clear the ice from the outside unit. I thought that it would be maybe once per week, but it does it several times per day. When it goes into defrost mode, it doesn't produce any heat and the house gets very cold.

It has only been just below the freezing mark in the last few weeks, but even when it was above the freezing mark, it would still go into defrost mode often. Mini split heat pumps go into defrost mode essentially when it needs to. The frequency depends on the weather, humidity, airflow and overall outside conditions.

This means it could go into defrost mode multiple times per day. However, it should not be excessive. There are two things you should check, airflow and Freon levels.

Defrost problems can often be attributed to an airflow problem. Essentially the compressor and the air around the compressor are not getting hot enough to melt the ice.

Therefore it goes into defrost mode. When it goes into defrost mode the system shuts off and heats the compressor in order to melt the ice. Then once the compressor is heated and free from ice, it starts the system back up. One way to fix airflow is to remove all obstructions around the unit: blankets, covers, etc. Second, you should have the refrigerant charge checked. Each system has a capacity of Freon.

If the system is not at full capacity it does not have the capability to keep the system and its surrounding atmosphere fully heated. If the Freon levels are at capacity and airflow is sufficient, you should not have this problem.

The system will go into defrost as needed, which is determined by a sensor that measures coil temperature. The system refrigerant is colder than the outdoor temperature, so it does not need to be freezing outside for the system to need defrost. Of course, the colder it is the more often it will need to defrost. Answer Save. Still have questions? Get your answers by asking now.This may cause slight delays.

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mini split stuck in defrost

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