12 Troubleshooting
Installer reference guide
79
ERHQ+ERLQ011~016 + EHBH/X11+16CB
Daikin Altherma – Low temperature split
4P384974-1 – 2015.01
12.2
Precautions when troubleshooting
WARNING
▪ When carrying out an inspection on the switch box of
the unit, always make sure that the unit is disconnected
from the mains. Turn off the respective circuit breaker.
▪ When a safety device was activated, stop the unit and
find out why the safety device was activated before
resetting it. NEVER bridge safety devices or change
their values to a value other than the factory default
setting. If you are unable to find the cause of the
problem, call your dealer.
DANGER: RISK OF ELECTROCUTION
WARNING
Prevent hazard due to the inadvertent resetting of the
thermal cut-out: this appliance must NOT be supplied
through an external switching device, such as a timer, or
connected to a circuit that is regularly turned ON and OFF
by the utility.
DANGER: RISK OF BURNING
12.3
Solving problems based on
symptoms
12.3.1
Symptom: The unit is NOT heating or
cooling as expected
Possible causes
Corrective action
The temperature setting is NOT
correct
Check the temperature setting on
the remote controller. Refer to
the operation manual.
The water flow is too low
Check and make sure that:
▪ All shut-off valves of the water
circuit are completely open.
▪ The water filter is clean. Clean
if necessary.
▪ There is no air in the system.
Purge air if necessary. You
can purge air manually (see
"To perform a manual air
purge" on page 75
) or use the
automatic air purge function
(see
"To perform an automatic
air purge" on page 75
).
▪ The water pressure is >1 bar.
▪ The expansion vessel is NOT
broken.
▪ The resistance in the water
circuit is NOT too high for the
pump
(see
"14.9
ESP
curve" on page 133
).
If the problem persists after you
have conducted all of the above
checks, contact your dealer. In
some cases, it is normal that the
unit decides to use a low water
flow.
Possible causes
Corrective action
The water volume in the
installation is too low
Make sure that the water volume
in the installation is above the
minimum required value (see
"6.4.3 To check the water
volume" on page 26
).
12.3.2
Symptom: The compressor does NOT
start (space heating or domestic water
heating)
Possible causes
Corrective action
The unit must start up out of its
operation range (the water
temperature is too low)
If the water temperature is too
low, the unit uses the backup
heater to reach the minimum
water temperature first (15°C).
Check and make sure that:
▪ The power supply to the
backup heater is correctly
wired.
▪ The backup heater thermal
protector is NOT activated.
▪ The backup heater contactors
are NOT broken.
If the problem persists after you
have conducted all of the above
checks, contact your dealer.
The preferential kWh rate power
supply settings and electrical
connections do NOT match
This should match with the
connections as explained in
"6.5 Preparing electrical
wiring" on page 27
and
"7.9.9 To
connect the main power
supply" on page 43
.
The preferential kWh rate signal
was sent by the electricity
company
Wait for the power to return (2
hours max.).
12.3.3
Symptom: The pump is making noise
(cavitation)
Possible causes
Corrective action
There is air in the system
Purge air manually (see
"To
perform a manual air purge" on
page 75
) or use the automatic air
purge function (see
"To perform
an automatic air purge" on
page 75
).
The water pressure at the pump
inlet is too low
Check and make sure that:
▪ The water pressure is >1 bar.
▪ The manometer is not broken.
▪ The expansion vessel is NOT
broken.
▪ The pre-pressure setting of the
expansion vessel is correct
(see
"6.4.4 Changing the pre-
pressure of the expansion
vessel" on page 27
).
12.3.4
Symptom: The pressure relief valve opens
Possible causes
Corrective action
The expansion vessel is broken
Replace the expansion vessel.
