Samsung MH026FPEA Training Manual

Also see for MH026FKEA: User manual User manual Installation manual Service manual Service manual

101Samsung ElectronicsTroubleshooting8-3-8 When the 4-Way valve is not operating1. Checklist :1) Are the 4-Way valve under the operating conditions?When the Comp. is on during the heating operating.2) Is the power voltage normal?3) Is the connecting of 4-Way valve good?2. Troubleshooting procedure✳ 4-Way valve operating conditions(1) During the defrost control, put the 4-Way valve off.(2) During the heating operation put the 4-Way valve on.(3) The changeover of heating to cooling : put the 4-Way valve off immediately (in case of B and C room).(4) The changeover of cooling to heating : it is on after 170 seconds delay.YesNoNoNoNoYesYesYesYesKeep 4-Way valve off.NormalDefect of RY76 (RY77) contact and coil→ Replace the RelayDefect of IC06 (IC07) output→ ReplaceDefect of IC04(MICOM) -replace the IC04 or PCB ass’yPut off the outdoor unit power and put it on again after 5 seconds.Select the heating operation of room by the remote control.NormalHas 3 minutes passed after selection of room heating?Is the 4-Way valve on?Is the pin #47(46) of IC04 (MICOM) at high (DC 5V) ?NoIs the 4-Way valve under operating conditions?Is the voltage shown across the 4-Way valve connector(CN75, CN76) ?