Checked Daikin ducted heat pump model number DZ17VSA601BA Serial E002695 System is three years old diagnosed system is not going into defrost mode and ice is developing on the condenser coil recommend to replace faulty defrost sensor and defrost control board as per Daikin Office personnel please follow up with homeowner On pricing of these parts, note Both condensers are sitting on the ground highly recommend to elevate the condensers on floor Mount pads, office personnel please send quote for this system is working at this time View visual findings from this job here - https://visionshare.xoi.io/?id=XA-15F7-F1DCF242210C49DB9541900F368DF954