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Started By
Message
Mini-Split AC Help Needed
Posted on 5/23/26 at 6:34 pm
Posted on 5/23/26 at 6:34 pm
I have a dual zone minisplit. One indoor unit is in the garage, the other in the bonus room above the garage.
The garage is cooling fine, blows about 62° at the vent. The bonus room doesn’t appear to be cooling at all. Blows room temp, which is way too hot right now.
I cleaned the filters and tried adding some Freon (R410a) with one of the DIY can kits. I had both indoor units on, set to cool, and lowest temp. System didn’t seem to take any Freon. Both of the small liquid lines iced up.
Can I assume it has plenty of refrigerant since the garage unit is cooling? Or does a pro need to properly draw it down and recharge?
Anything else I can try??
Unit is a Durastar. Made by Diken I think.
Thanks yall.
The garage is cooling fine, blows about 62° at the vent. The bonus room doesn’t appear to be cooling at all. Blows room temp, which is way too hot right now.
I cleaned the filters and tried adding some Freon (R410a) with one of the DIY can kits. I had both indoor units on, set to cool, and lowest temp. System didn’t seem to take any Freon. Both of the small liquid lines iced up.
Can I assume it has plenty of refrigerant since the garage unit is cooling? Or does a pro need to properly draw it down and recharge?
Anything else I can try??
Unit is a Durastar. Made by Diken I think.
Thanks yall.
2
Posted on 5/24/26 at 10:31 am to GeekedUp
You 100% need this:
Based on these statements:
Mini-splits have a very tight window for the amount of charge. Traditional ways of charging by subcool/superheat don't cut it with minisplits. Needs to be removed and weighed in exactly. You also might have a hard time finding someone willing to work on it if its some chinese off-brand. Those are thrown away more often than they are repaired.
quote:
a pro need to properly draw it down and recharge?
Based on these statements:
quote:
Freon (R410a) with one of the DIY can kits.
quote:
Can I assume it has plenty of refrigerant since the garage unit is cooling?
Mini-splits have a very tight window for the amount of charge. Traditional ways of charging by subcool/superheat don't cut it with minisplits. Needs to be removed and weighed in exactly. You also might have a hard time finding someone willing to work on it if its some chinese off-brand. Those are thrown away more often than they are repaired.
Posted on 5/25/26 at 9:29 am to Turnblad85
Thank you sir. Will do. Why would one head cool and not the other if it’s a closed system?
Durastar is just Ferguson’s house brand. Made by Daikin which are very good. Should be good there and would be under warranty if it’s something other than refrigerant. Hate to spend the money to call someone out but need to watch movies in comfort.
Durastar is just Ferguson’s house brand. Made by Daikin which are very good. Should be good there and would be under warranty if it’s something other than refrigerant. Hate to spend the money to call someone out but need to watch movies in comfort.
Posted on 5/25/26 at 9:53 am to GeekedUp
quote:
Why would one head cool and not the other
My guess is something in the controls/wiring. If you had a leak, the other would also not work or not work well. Unfortunately adding 410 guaranteed someone with a scale needs to come out.
To save face, tell them your dummy brother in law added the extra refrigerant .
Posted on 5/25/26 at 11:41 am to GeekedUp
I agree adding refrigerant without a proper diagnosis was not wise.
I’m sure that unit has a circuit board that provides error codes - check the owners manual - and see if you have an error code(s) that can help with the diagnosis.
That said, have you tried one of the most simple things - do a hard reset of the unit, to see if that might get the second head to resume cooling. Turn off the circuit breaker that powers the unit, wait a few a minutes, and turn it back on. Like rebooting a computer. Can clear error codes-glitches, if only temporarily.
Did you check to see if evaporator coil in the non-cooling head is freezing up? I assume the blower fan in the non-cooling head working as you said it blowing room temperature air.
I’m sure that unit has a circuit board that provides error codes - check the owners manual - and see if you have an error code(s) that can help with the diagnosis.
That said, have you tried one of the most simple things - do a hard reset of the unit, to see if that might get the second head to resume cooling. Turn off the circuit breaker that powers the unit, wait a few a minutes, and turn it back on. Like rebooting a computer. Can clear error codes-glitches, if only temporarily.
Did you check to see if evaporator coil in the non-cooling head is freezing up? I assume the blower fan in the non-cooling head working as you said it blowing room temperature air.
Posted on 5/25/26 at 1:04 pm to CrawDude
quote:
To save face, tell them your dummy brother in law added the extra refrigerant
Solid move. Didn’t seem like any extra went in, but people fathered children thinking the same thing.
No error codes but I haven’t tried a reset. Will do. The non-cooling head will switch modes via the remote and blow air. Haven’t checked heat, but makes me wonder if it’s some sort of thermostat issues. Like it doesn’t know to cool.
Posted on 5/25/26 at 8:14 pm to GeekedUp
quote:
Didn’t seem like any extra went in
You should be able to weigh the bottle and see how much was removed. Then do as Craw said and look at display for trouble codes.
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