Daikin Altherma 3 ECH2O, Installation And Maintenance Instructions Manual

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8 Faults and malfunctions
Installation and maintenance instructions
43
Daikin Altherma EHS(X/H)(B)-D
Heat pump (indoor unit) with integrated heat accumulator
008.1444099_01 – 11/2018 – EN
Malfunction Possible cause Possible solution
Internal circulation
pump generates ex-
cessively high operat-
ing noises Air in the water circuit. ▪ Completely vent the heating system and the internal circula-
tion pump.
Noises caused by vibrations.
▪ Check the indoor unit, its components and covers to ensure
they are fastened correctly.
Bearing damage in the internal circulation pump
▪ Replace the internal circulation pump.
Water pressure at pump inlet too low. ▪ On the controller [→ Main menu → Information → Overview],
check that sufficient water pressure (> 0.5 bar) is available.
▪ Check that the pressure gauge is working correctly (connec-
tion of an external pressure gauge).
▪ Check the admission pressure in the expansion tank and wa-
ter pressure; if necessary, top up the heating water and adjust
the admission pressure.
Safety pressure relief
valve is leaking or al-
ways open Expansion tank is defective. ▪ Replace the expansion tank.
Water pressure in heating system is too high.
▪ On the controller [→ Main menu → Information → Overview],
check that the water pressure is below the specified maximum
pressure. If necessary, drain sufficient water until the pressure
is in the middle of the permissible range.
Safety pressure relief valve is stuck.
▪ Check the safety pressure relief valve and if necessary, re-
place it.
▪ Turn the red knob on the safety pressure relief valve anti-
clockwise. If you can hear a rattling noise, the safety pres-
sure relief valve needs replacing.
Tab. 8-1 Possible malfunctions
8.3 Fault codes
Code Component/Designation Error Possible fault rectification
E75 Inflow temperature sensor
t
V, BH
Inflow temperature sensor error Inflow temperature sensor defective.
▪ Check, replace.
E76 Storage tank temperature
sensor t
DHW1
Storage tank temperature sensor error Storage tank temperature sensor t
DHW1
or connecting
cable defective or not connected.
▪ Check, replace.
▪ Check the [Tank temperature sensor] setting.
E81 RoCon BM2C printed circuit
board Communication fault Parameter storage in the EEPROM corrupted.
▪ Contact a service technician.
E88 RoCon BM2C printed circuit
board Parameter storage in the external flash memory cor-
rupted.
▪ Contact a service technician.
E91 Connected CAN modules CAN module bus ID duplicated, set unique data bus
address.
E128 Return flow temperature
sensor t
R1
Return flow temperature sensor error Return flow temperature sensor t
R1
in FLS flow
sensor connecting cable defective.
▪ Check, replace.
E129 Pressure sensor DS Pressure sensor error Pressure sensor DS defective.
▪ Check, replace.