4-20Trouble shooting4-3. Appropriate Measures for Different Symptoms4-3-1. Fan coil unit ROOM sensor error (OPEN/SHORT)1. How to checkYesDid the indoor room temperature sensorconnectorbreak away from the PCB?Did the resistance value significantlystray from the following temperature table?After separating the indoor room temperature sensorconnector from the PCB, measure the resistance valuebetween the two terminals.Restart operation after replacing the PCB.Restart operation after connecting theconnector to the PCB.Replace indoor room temperature sensoras it is defective.YesNoNoTemp.(°C)706050403020100‑10Resistance(KΩ)2.23.04.25.88.312.118.027.343.0EX) ROOM TEMPERATURE 26℃‑RESISTANCE 09.26KΩError numberFan coil unitdisplayDuct, cassette (1‑Way/2‑Way/Mini 4‑Way) 4‑Way cassette type Wall mount type Circular cassette typeLED Indicationor orr u n /stop Defrost Timer CleanFilter18°C 21°C Timer 24°C 27°C IceBlueYellowGreen Blue Red1‑Wayblue Yellowgreen2‑WayGreen Red× × ◑ × × × ◑ × × × × ◑ × × × × × ◑Criteria ∙ Refer to the judgment method belowCause ofproblem ∙ Faulty OPEN/SHORT of number xxx fan coil unit indoor temperature sensor
