20 Most Recent Mitsubishi Mr. Slim MXZ30TN Air Conditioner - Page 6 Questions & Answers

You can get those manual from www.mrslim.com easily.

Clean filters. disconnect from power for 10 minutes Reconnect and replace flitrs restart units. Set to heat on high. Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/john_28069c9efb56199d

high side approximately 1500kpa and lo side about 400kpa depending the outside air temp. Mitsubishi high side been known to run higher on some units though

Check circuit breaker and isolator switch is on

May be showing a fault code, you need to count how many times it flashes. Could also be a delay or de ice mode which will go away after a few minutes

When the system cools it removes moisture from the air, some systems will cycle between cool and heat modes to regulate the temp.

Most likely low on refrigerant, liquid line ( small pipe ) can frost up and indoor coil can start to ice up.

http://www.youtube.com/watch?v=sYNN1Rvc7r0Try this