ESIE15-08B | Part 2. Troubleshooting 2. Error code based troubleshooting19/07/16 Page 47Daikin Altherma Monobloc CA2.63. “89-01” – Plate heat exchanger freeze-up error2.64. “89-02” – Plate heat exchanger freeze-up warning during space heating / DHWproductionTrigger Effect ResetWhen warning 89-02 (Tc < 0°C duringspace heating) occurs 3 times (with lessthan 30 minutes between each abnormal-ity).Unit stops operating. Manual reset via user interface.When warning 89-03 (Te < x°C duringdefrost) occurs 3 times (with less than 30minutes between each abnormality).Unit stops operating. Manual reset via user interface.Possible cause Check Corrective actionFaulty heat exchanger thermistor R2T. Check hydrobox heat exchanger thermis-tor R2T (see page 70).Replace heat exchanger thermistor whenrequired (see page 124).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.Refrigerant shortage. Check for refrigerant shortage (seepage 106).Perform leak test.If charge is lower than indicated on name-plate, check for leaks and recharge unitwith correct amount of refrigerant.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 leaks.Water flow is too low. Check the minimum water flow requiredfor the system. Refer to Installer Refer-ence Guide.Adjust system to meet the water flowrequirements.Water volume is too low. Check if the smallest water volume meetsthe requirements. Refer to "Installer Ref-erence Guide". (Pay attention to theby-pass in the water circuit!)Adjust system and water volume to therequirements as described in the InstallerReference Guide.Trigger Effect ResetTc is below 0°C during space heating. Unit will continue operation. Auto-reset when problem is solved.Warning might result to 89-01 error if itoccurs 3 times.R3T (liquid refrigerant) < or = 0°C duringspace heating or DHW.Unit will stop and restart when problem issolved.Possible cause Check Corrective actionFaulty 4-way valve. Check 4-way valve (see page 99). Replace 4-way valve when required (seepage 127).
