8
Faults and malfunctions
Installation and maintenance instructions
42
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
Room cooler does not
cool
Water flow too low.
▪ 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 circula-
tion pump.
▪ On the controller [→ Main menu → Information → Overview
→ Psyst], check that sufficient water pressure (> 0.5 bar) is
available; if necessary, top up heating water.
▪ Check that the resistance in the water circuit is not too high
for the pump (see
Chap. 10
).
"Cooling" shut off (e.g. room thermostat requests
"Cooling", but switching time program is in the eco-
nomy phase, outside temperature too low).
▪ Check the operating mode setting.
▪ Check the request parameters.
▪ Check the date, time and switching time program settings on
the controller.
Refrigerant compressor is not working.
▪ With backup heater (EKBUxx) installed:
▪ Check that the backup heater heats the return flow temperat-
ure to at least 15 °C (at a low return flow temperature, the
heat pump uses the backup heater first to achieve this min-
imum return flow temperature).
▪ Check mains supply of the backup heater (EKBUxx).
▪ Thermal contactor (STB) on the backup heater (EKBUxx) has
triggered. Unlock.
System is in "Heating" operating mode.
▪ Switch the operating mode to "Cooling".
Outside temperature < 4 °C
▪ The heat pump has automatically switched to "Heating" oper-
ating mode to be able to guarantee frost protection if the out-
side temperature continues to fall. No room cooling possible.
Cooling output for room
cooling too low
Water flow too low.
▪ 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 circula-
tion pump.
▪ On the controller [→ Main menu → Information → Overview
→ Psyst], check that sufficient water pressure (> 0.5 bar) is
available; if necessary, top up heating water.
▪ Check that the resistance in the water circuit is not too high
for the pump.
Water volume in heating system too low.
▪ Check the admission pressure in the expansion tank and wa-
ter pressure; if necessary, top up the heating water and adjust
the admission pressure.
Refrigerant quantity in the heating system too low or
too high.
▪ Determine causes of too low or too high refrigerant quantity in
the refrigerant circuit.
▪ If the refrigerant quantity is too low, check the refrigerant
circuit for leaks, repair and add refrigerant.
▪ If the refrigerant quantity is too high, recycle the refrigerant
and refill the system with the correct quantity.
Summary of Contents for Altherma 3 ECH2O
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