12 Troubleshooting; Overview: Troubleshooting; Precautions When Troubleshooting; Solving Problems Based On Symptoms - Daikin Altherma EHVH08SU18CB6W Installer's Reference Manual

12 Troubleshooting

12 Troubleshooting
12.1

Overview: Troubleshooting

This chapter describes what you have to do in case of problems.
It contains information about:

▪ Solving problems based on symptoms

▪ Solving problems based on error codes
Before troubleshooting
Carry out a thorough visual inspection of the unit and look for
obvious defects such as loose connections or defective wiring.
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 shunt 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 hazards due to inadvertent resetting of the thermal
cut-out: power to 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 as
expected
Possible causes
The temperature setting is NOT
correct
Installer reference guide
80
Corrective action
Check the temperature setting on
the remote controller. Refer to
the operation manual.
Possible causes
The water flow is too low
The water volume in the
installation is too low
12.3.2 Symptom: The compressor does NOT
start (space heating or domestic water
heating)
Possible causes
The unit must start up out of its
operation range (the water
temperature is too low)
The preferential kWh rate power
supply settings and electrical
connections do NOT match
The preferential kWh rate signal
was sent by the electricity
company
ERLQ004~008CA + EHVH04+08SU18+26CB6W
Corrective action
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 the ESP curve in
the "Technical data" chapter).
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.
Make sure that the water volume
in the installation is above the
minimum required value (see
"6.4.3 To check the water volume
and flow rate" on page 27).
Corrective action
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.
This should match with the
connections as explained in
"6.5 Preparing electrical
wiring" on page 28 and "7.9.7 To
connect the main power
supply" on page 44.
Wait for the power to return (2
hours max.).
Daikin Altherma – Low temperature split
4P449978-1B – 2018.07