ESIE15-08B | Part 2. Troubleshooting 2. Error code based troubleshootingPage 44 19/07/16Daikin Altherma Monobloc CA2.56. “7H-04” – Water flow abnormality during DHW operationWater in the system: during cooling opera-tion the flow < 6 l/min (5 kW unit), < 10l/min(7 kW unit) for 15 seconds.Unit will stop operating. Manual reset via user interface.Water in the system: during defrost opera-tion or BUH operation the flow < 12 l/minfor 15 secondsUnit will stop operating. Manual reset via user interface.Possible cause Check Corrective actionClosed valve in water circuit. Check if all valves are open. Adjust / open valve.Water pressure is too low. Check the water pressure on the pressuregauge.Increase water pressure till ~ 2 bar. Referto the Installer Reference Guide.Check for possible water leak. Fix water leak.Air in water circuit / unit. Check if all air purge valves are open.Check if air purge valves are installed onall highest points of the field installedwater circuit.Purge air out of unit and field suppliedwater system and backup heater. Refer tothe Installer Reference Guide.Static pressure of water circuit is too high. Check the system design and determinestatic pressure of the water circuit (foreach loop).Correct hydraulic field circuit (e.g. use ofbalancing bottle). Refer to the InstallerReference Guide or to the Data Book (forpump characteristics).Water filter is blocked. Check water filter. Clean water filter.Check water quality and possible sourceof dirt.Faulty 3-way valve (integrated /EKSWW(U) / EKHWS(U) / EKHWE).Check 3-way valve (see page 84). Replace 3-way valve when required.Faulty shut off valve or tank thermostatQ2L (EKSWWU / EKHWSU).Check shut off valve and Q2L (seepage 69).Replace 3-way valve when required.Faulty flow sensor. Check flow sensor (see page 81). Replace flow sensor or replace hydroPCB A1P when required.If flow sensor failed due to contamination,check for source of contamination andconsider to install an additional water fil-ter.Faulty water pump. Check water pump (see page 73). Replace water pump (see page 133) orreplace hydro PCB A1P when required.If flow sensor failed due to contamination,check for source of contamination andconsider to install an additional water fil-ter.No by-pass installed. Check by-pass settings (refer to InstallerReference Guide).Install by-pass.Settings of by-pass are wrong. Check by-pass settings (refer to InstallerReference Guide).Change settings.Faulty hydro PCB A1P. Check if the alive led is blinking in regularintervals.Check if the correct spare part is installed.Check if hydro PCB A1P receives power.Adjust the power to the PCB.Replace hydro PCB A1P when alive led isnot blinking in regular intervals.Adjust software of hydro PCB A1P orinstall correct spare part when required.TIP: Check if problem also happens in short water circuit (for example domestic hot water circuit).Trigger Effect ResetWater flow abnormality detected mainlyduring DHW operation.Unit will stop operating, after some time itwill automatically try to start operatingagain.Manual reset via user interface.
