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Ac runs for a while then stops and operation light flashes

I have a wall mounted unit in my office that runs well for half hour then stops, the operation light flashes once this happens and there is no airflow, ive had an engineer look at it and he said when he put the gauges on it ( the outdoor unit)was running at 8 bar on the low side and was running at 8 bar but the high pressure side would get up to a very high pressure but then it cuts out,any ideas please?!?

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Re: ac runs for a while then stops and operation light...

This can happen in cold humid weather, when you use heating mode and the outside unit freezes up. All my split-type airconditioners do that occasionally when the weather is like that. The inside fan stops for some 10 minutes with light flashing, then it picks up again after the outside unit warmed up.

Posted on Jan 09, 2008

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Re: ac runs for a while then stops and operation light...

Hello, It depends what refrigerant the system is on but if it tripping out on HP it could be overcharged with gas or a problem with the outside condesor fan.

Posted on Feb 15, 2007

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What does blinking light on wall unit mean?

When the Operation lamp is flashing, the unit can't operate efficiently and has shut off. Check and clean the Air Filters. Check that nothing is blocking the air inlet or outlets (on all indoor units (if a multi-unit system) and the outdoor unit). Remove all obstructions. Turn the breaker to Off and then On again. Check if the unit works with the remote.

If you have a multi-unit system, make sure that all indoor units are in the same Operation mode. If the units are on Auto, make sure that all units are set for Heat or Cool.

If the unit continues to have the Operation light flash, then you need to contact your service professional. The Operation manual for the FTXS18HVJU is available here:

I hope this helps.

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