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Malfunction
Air in the water circuit.
Noises caused by vibrations.
Bearing damage in the internal circulation
pump
Internal circulation pump
generates excessively
high operating noises
Water pressure at pump inlet too low.
Expansion tank is defective.
Water pressure in heating system is too high.
Safety pressure relief
valve is leaking or always
open.
Safety pressure relief valve is stuck.
Tab. 8-1 Possible malfunctions on the Altherma M ECH
Daikin Altherma M ECH
O
2
Solar storage tank with heating controller
008.1446799_00 – 07/2019 – EN
8
x
Possible cause
O
2
Errors, malfunctions and messages
Possible solution
● Completely vent the heating system and the internal
circulation pump.
● Check the Altherma M ECH
covers to ensure they are fastened correctly.
● Reduce pump speed (parameters [Min Perform Pump]
and [Max Perform Pump]).
● Replace the internal circulation pump.
● On the controller (rotary switch position "Info"
check whether sufficient water pressure (> 0.5 bar) is
available; if necessary, top up heating water.
● Check whether the pressure gauge is working
correctly (connection of an external pressure gauge).
● Check admission pressure in the expansion tank and
water pressure; if necessary, top up heating water and
adjust admission pressure (see chap. 7.4).
● Replace expansion tank.
● On the controller (rotary switch position "Info"
check whether the water pressure is below the
specified maximum pressure. If necessary, drain suffi-
cient water until the pressure is in the middle of the
permissible range.
● Check safety pressure relief valve and if necessary,
replace it.
– Turn the red knob on the safety pressure relief
valve counterclockwise. If you can hear a rattling
noise, the safety pressure relief valve needs
replacing.
O, its components and
2
),
),
Installation and maintenance instructions
49
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