ESIE15-08B | Part 2. Troubleshooting 4. Component checklist - Water CircuitPage 86 19/07/16Daikin Altherma Monobloc CA4.11. Extension PCB A4P1. Switch off the Daikin Altherma Monobloc CA via the user interface.2. Switch off the Daikin Altherma Monobloc CA with the field supplied circuit breaker.3. Remove the hydrobox top plate assembly, refer to "Removing the hydrobox top plate assembly" on page 1104. Remove the hydrobox front plate, refer to "Removing the hydrobox front plate" on page 111.5. Remove the switch box cover.6. LED:If LED 5 is blinking = communication error between PCB A4P and PCB A1P:- Check connectors on PCB.- Check connection between PCB A4P (X10A) and A6P (X10A)- Check connection between PCB A2P (X1A) and A1P (X10A)- Check power supply to PCB A1P.- If all above checks are OK, replace PCB A4P.If LED 2 is not blinking:- Replace PCB A4P.Technical specification Description- The extension PCB A4P is used to control the unitfrom the control box.LocationWiring diagram Switch box - Control Box UnitCheck procedureElectrical checkWARNING: R ISK OF F IRE• When reconnecting a connector to the PCB, do not apply force or damage the connector or the connector pins onthe PCB.X1M X8M X2MK2AK3MK1AA4PF2BX4MNot applicable
