Daikin Altherma 3 H HT ECH2 O Referenzhandbuch Für Den Monteur Seite 38

7 Faults and malfunctions
Fault
Room cooler does not Water flow too low.
cool
"Cooling" shut off (e.g. room thermostat requests
"Cooling", but switching time program is in the
economy phase, outside temperature too low).
Refrigerant compressor is not working.
System is in "Heating" operating mode.
Outside temperature < 4 °C
Cooling output for room Water flow too low.
cooling too low
Water volume in heating system too low.
Internal circulation Air in the water circuit.
pump generates ex-
cessively high operat-
Noises caused by vibrations.
ing noises
Bearing damage in the internal circulation pump
Water pressure at pump inlet too low.
Safety pressure relief Expansion tank is defective.
valve is leaking or al-
Water pressure in heating system is too high.
ways open.
Safety pressure relief valve is stuck.
Tab. 7-1 Possible malfunctions
Installer reference guide
38
Possible cause Possible solution
▪ Check that all stop valves of the water circuit are fully open.
▪ Check that the water filter is dirty.
▪ Check if the expansion tank is defective.
▪ Completely vent the heating system and the internal circulation
pump.
▪ On the controller [→ Main menu → Information → Overview
→ Psyst], check that sufficient water pressure (> 0.5 bar) is avail-
able; if necessary, top up the heating water.
▪ Check that the resistance in the water circuit is not too high for
the pump (see Technical data).
▪ Check the operating mode setting.
▪ Check the request parameters.
▪ Check the date, time and switching time program settings on the
controller.
▪ With backup heater (EKBUxx) installed:
▪ Check that the backup heater heats the return flow temperature
to at least 15 °C (at a low return flow temperature, the heat pump
uses the backup heater first to achieve this minimum return flow
temperature).
▪ Check mains supply of the backup heater (EKBUxx).
▪ Thermal contactor (STB) on the backup heater (EKBUxx) has
triggered. Unlock.
▪ Switch the operating mode to "Cooling".
▪ The heat pump has automatically switched to "Heating" operating
mode to be able to guarantee frost protection if the outside tem-
perature continues to fall. No room cooling possible.
▪ Check that all stop valves of the water circuit are fully open.
▪ Check that the water filter is dirty.
▪ Check if the expansion tank is defective.
▪ Completely vent the heating system and the internal circulation
pump.
▪ On the controller [→ Main menu → Information → Overview
→ Psyst], check that sufficient water pressure (> 0.5 bar) is avail-
able; if necessary, top up the heating water.
▪ Check that the resistance in the water circuit is not too high for
the pump.
▪ Check the admission pressure in the expansion tank and water
pressure; if necessary, top up the heating water and adjust the
admission pressure.
▪ Completely vent the heating system and the internal circulation
pump.
▪ Check the indoor unit, its components and covers to ensure they
are fastened correctly.
▪ Replace the internal circulation pump.
▪ 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 (connection of
an external pressure gauge).
▪ Check the admission pressure in the expansion tank and water
pressure; if necessary, top up the heating water and adjust the
admission pressure.
▪ Replace the expansion tank.
▪ 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.
▪ Check the safety pressure relief valve and if necessary, replace
it.
▪ Turn the red knob on the safety pressure relief valve anticlock-
wise. If you can hear a rattling noise, the safety pressure relief
valve needs replacing.
Heat pump (indoor unit) with integrated heat accumulator
Daikin Altherma ETS(X/H)(B)-D
008.1447299_00 – 06/2019 – EN