8
Faults and malfunctions
Installation and maintenance instructions
41
Daikin Altherma EHS(X/H)
Daikin Altherma integrated solar unit
008.1444099_00 – 07/2018 – 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 ("Info" 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
).
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. inflow temperature] parameter.
Weather-dependent inflow temperature control act-
ive.
▪ Check the [Heating operation limit], [Heat-Slope] parameters
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], [Ext. power level
1] and [Ext. power level 2] parameters [→ Main menu → Set-
tings → 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
Hot water supply 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
Hot water preparation shut off (e.g. switching time
program is in the economy phase, parameters for
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 hot water
supply 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], [Ext. power level
1] and [Ext. power level 2] parameters [→ Main menu → Set-
tings → Ext. Source].
