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I have a system 4 MHI using for 3.5 years. Now having problems cannot turn on, lights on the fan coil have orange blink four times follow by lights in green & orange blink 4 times and this repeat itself again and again. Have 4 contractors to check and everyone told me a different faults First one told me gas NOT enough, very confident. After refilling gas, problems still exists Second one told me gas value cannot open fully, after changing, problems still exists Third one told me Thermostat spoilt, after changing, problems still exists Four one ( also the SOLE AGENT told me the dirt inside the gas pipe that block the gas flow fully, Charge me $80 SDG for troubleshooting ONLY. NOT repair done, if repair, this $80 cannot take into account. Very bad experience. Please do not buy Mitsubishi Heavy Industries air con for this model. SOLE AGENT office very PROUD guy. This is the model, PLEASE DO NOT BUY THIS MODEL, only last 3.5 years SCM80ZJ-S ( compressor ) SRK60ZJ-S ( fan coil ) SRK35ZJ-S ( fan coil ) SRK25ZJ-S ( fan coil ) SRK25ZJ-S ( fan coil ) PLEASE DO NOT BUY, bad after sales support from their SOLE AGENT. Very PROUD PROUD attuide.