Split System A/C - Heat Pump FAQs-3

Diagnostic Q&A #3

Split System A/C or Heat Pump Indoor Blower Fan FAQs

Split System Fan Won't Run in HEAT Mode

I have a ductless split system ac & heat.

The unit turns on fine ac works but now that i want to switch to heat the fan won't run at all it just stays in heat mode without the fan running. Any suggestions on how to make it work or why the fan won't run? On 2018-12-31 by Marcos

Reply by (mod) - if the fan won't run it's often because the heat Source isn't operating

Typically when we are in heating mode if the fan won't run it's because the heat Source isn't operating.

The problem is probably not the fan but the fact that your heat pump isn't able to run or the temperatures are so cold that the backup heat is being called on and that's not running.

Other Split System A/C or Heat Pump FAQs

White smoke or steam is coming out of Fujitsu wall-mounted split system air conditioner/heat pump

We saw smoke or maybe it was steam (since it didn't smell) coming out of our wall-mounted split system air conditioner/heat pump - is this dangerous? - Anon.

Reply:

Fujitsu has pointed out that at least on their mini split system heat pump/air conditioner wall mounted units a white steam coming from the air handler indoors may be perfectly normal. [9]

• During Cooling or Dry operation, a thin mist may be seen emitted from the indoor unit. This results from the sudden cooling of room air by the air emitted from the a/c, resulting in condensation and misting.
• During Heating operation, the outdoor unit's fan may stop, and steam may be seen rising from the unit.
  
  This is due to Automatic Defrosting operation. [Sizzling noises from a split system air conditioner / heat pump may be heard at the wall mounted unit when the system is in heating mode.[10] ]

Where to get a Manual for my Firstline Split A/C Unit

(Sept 22, 2012) roy said:

I have a firstline split airconditioner mod no.fcs 12000ch.. I wish to move it to another area of my home.

First can you tell me where I can get a instruction/maintainence manual. I would like to know if this model
can service two wall mount outlets. Thank You Roy

Reply:

Roy,

Take a look at the outdoor compressor / condenser unti. If yours can handle more than one indoor air handler there will be more than one refrigerant piping hookup connections.

You can obtain a service and installation for Firstine split system air conditioners from

SELECTAIRE / FIRSTLINE HVAC

Unionaire Split air conditioner with a Honeywell type of wall digital switch compressor wiring

(Nov 20, 2012) Airkool guy said:

I am trying to replace the remote control of a Unionaire Split air conditioner with a Honeywell type of wall digital switch that controls fan speed and temperature. Iv managed to wire the fan and on off controls but I can't seem to get the compressor wiring correct. What is correct wiring procedure to follow?

Reply:

Airkool,

Over at our THERMOSTATS, HEATING / COOLING - home page there are articles on wiring details. But also for the equipment you named, most likely there are detailed wiring instructions in the box. If not give me model numbers and I'll look further.

Split System A/C Doesn't heat properly.

Split System A/C Doesn't heat properly. Control system turns off outside unit fan unexpectedly.

Outside unit fins get very cold, and eventually after some time (few minutes) A/C turns enters into defrost mode of operation (which is understandable).

The question is why control unit turns off outside fan? There is no problem with outside fan! It Works fine. Fan contactor also Works fine.

I also do not suspect to the control unit, since it also Works fine.

I suspect there can be two resaons for such a behaviour:

a) Malfunctioning inside the freon (since the installation guys didn't vacuum the system during instalation).

They just purged the air out of the inside unit using the freon pressure from the outside unit and then quickly closing the nut). I complained, but they were persistant in persuading me that despite the precise instructions from Tosniba's Installation Manual: "Svstam must be vacuumed to (specific vacuum)..", it is not needed.

b) Temperature sensor is giving wrong dana to control unit.

A/C is branded Toshiba, RAS 13 SKHP-ES. I do not blame Toshiba at all. I think I have problem with malinstallation. On 2017-02-23 by Anonymous -

Can't set heat low enough on Samsung ductless A/C / Heat Unit

I have a Samsung ductless ac-heat unit and want to set the heat to 50 at night and when I'm not around but it seems the lowest heat setting is 61.

I have this unit in my garage office. Should I just shut the unit off at the end of the day and turn on the next day. Or should I leave it at 61 all the time for the winter. I live in Boston area

. I don't want to tax the system by going on and off every night and morning or running it all the time. I'm not sure which is worse.

I don't want to waste my money running it all the time if it doesn't matter to the system. Thanks for advise and help. Btw. I love the system it worked great this past summer. On 2016-12-17 by Kevin k

Question: Samsung Wall Mount AC in heat mode flashes red & green & beeps: error codes mean what?

(Nov 28, 2012) Jade said:

I have a Samsung wall mount air conditioner, heating unti as well. Brand new and now when i try to put some heat on , it flashes red and green and beepes? What does this mean and how can i fix it?

Reply:

Let's get the model number; then we can find a decoding of the error codes.

Also see the Samsung manuals at SAMSUNG HVAC

Outside condenser fan speeds up, gets noisy, then shuts down, then restarts - cyccling

Our split unit A/C works fine for half an hour. Then the outside fan picks up speed and becomes noisy. It shuts down and after several minutes starts up again, only to begin the cycle again. However at night the unit operates as it should be. It is not the compressor (replaced already). (Feb 13, 2014) Nellie said:

Reply:

Nellie, it sounds as if the outside compressor/condenser unit is in trouble; I can't tell from your note if the concern is just the fan or fan motor, or if it's a more costly problem like the compressor itself.

But the fact that you say the system operates OK at night suggests that it's overheating, and having trouble working during warmer daytime hours. Some folks have tried diagnosing this overheating issue by spraying water up so that it falls as if rain onto the outside compressor condenser unit - cooling it down; in any event you need a service call.

Should I hire a pro to replace our Wintair Split A/C compressor or is it DIY?

Our wintair split ac, seems to have trouble starting. Upon start up the outdoor unit fan runs, but for abour 10 sec.

Then a loud humm, seems to cut the power to the fan, like a relay that cant seem to engage, or a motor that wont start. This repeats for about 10 times, and only then can you hear the compressor really engage.

And then it seems fine. .for now. Any ideas.- 7/31/14 Jeff 

Reply:

Jeff

It sounds as if the compressor is unable to start - a bad compressor motor or a failed start capacitor.

Jeff replies:

thanks for your reply, how to pinpoint the problem? I am pretty handy but dont have much experience with ac. I assume to replace any of these components, i dont need to mess with the refridgerants. Or would you recommend a pro to repair this?

Reply:

Jeff, If the compressor is failing it's not a repair a typical homeowner would nor should undertake.

Cutting, cleaning, soldering refrigerant lines, pulling a vacuum, installing new compressor, installing special burnout filter driers, and even before that, proper diagnosis of the problem are in order.