8
Faults and malfunctions
Installation and maintenance instructions
41
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
Heating does not warm
up enough
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 ("Information" menu), 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
).
Target value range is too low.
In [→ Main menu → Configuration → Heating]:
▪ Increase the [Heat-Slope ] parameter.
▪ Increase the [HZU max. temperature ] parameter.
▪ Increase the [Max. feed temperature] parameter.
Weather-compensated inflow temperature control
active.
▪ Check the [Heating operation limit] parameter, [Heat-Slope] in
[→ Main menu → Configuration → Heating].
Optional backup heater (EKBUxx) or alternative
heater booster not cut in.
▪ Check mains supply of the backup heater (EKBUxx).
▪ Thermal contactor (STB) on the backup heater (EKBUxx) has
triggered. Unlock.
▪ Check the [Config. of external heat source] and [Ext. power
level 1] and [Ext. power level 2] parameters [→ Main menu
→ Settings → Ext. source].
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 (see
Chap. 7.2.2
).
Domestic hot water preparation is taking too much of
the output of the heat pump.
▪ Check the settings of the [Config. of external heat source]
parameter [→ Main menu → Settings → Ext. source].
▪ Check the settings of the [Ext. hot water power] parameter
[→ Main menu → Settings → Ext. source].
Hot water does not
warm up
Domestic hot water preparation shut off (e.g. switch-
ing time program is in the economy phase, paramet-
ers for domestic hot water preparation incorrectly
set).
▪ Check the operating mode setting.
▪ Check the request parameters.
Storage tank charging temperature too low.
▪ Increase the target hot water temperature.
Draw-off rate too high.
▪ Reduce the draw-off rate, limit throughput.
Output of heat pump too low.
▪ Check the switching times for room heating and domestic hot
water preparation for overlaps.
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.
Optional backup heater (EKBUxx) or alternative
heater booster not cut in.
▪ Check mains supply of the backup heater (EKBUxx).
▪ Thermal contactor (STB) on the backup heater (EKBUxx) has
triggered. Unlock.
▪ Check the [Config. of external heat source] and [Ext. power
level 1] and [Ext. power level 2] parameters [→ Main menu
→ Settings → Ext. source].
Summary of Contents for Altherma 3 ECH2O
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