Precautions When Troubleshooting; Solving Problems Based On Symptoms; Symptom: The Unit Is Not Heating Or Cooling As Expected; Symptom: The Compressor Does Not Start (Space Heating) - Daikin CHYHBH05AA Installer's Reference Manual

13 Troubleshooting
13.2

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
13.3 Solving problems based on
symptoms
13.3.1 Symptom: The unit is NOT heating or
cooling as expected
Possible causes
The temperature setting is NOT
correct
The water flow is too low
Installer reference guide
78
Corrective action
Check the temperature setting on
the remote controller. Refer to
the operation manual.
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 71) or use the
automatic air purge function
(see "To perform an automatic
air purge" on page 71).
▪ 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.
Possible causes
The water volume in the
installation is too low
13.3.2 Symptom: The compressor does NOT
start (space heating)
Possible causes
The unit must start up out of its
operation range (the water
temperature is too low)
13.3.3 Symptom: The system is making gurgling
noises after commissioning
Possible cause
There is air in the system.
Various malfunctions.
(a) We recommend to purge air with the unit's air purge
function (to be performed by the installer). If you purge air
from the heat emitters or collectors, mind the following:
WARNING
Air purging heat emitters or collectors. Before you
purge air from heat emitters or collectors, check if an error
or is displayed on the home pages of the user interface.
▪ If not, you can purge air immediately.
▪ If yes, make sure that the room where you want to
purge air is sufficiently ventilated. Reason: Refrigerant
might leak into the water circuit, and subsequently into
the room when you purge air from the heat emitters or
collectors.
13.3.4 Symptom: The pump is making noise
(cavitation)
Possible causes
There is air in the system
Daikin hybrid for multi heat pump – heat pump module
Corrective action
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 19).
Corrective action
If the water temperature is too
low, the unit uses the gas boiler
to reach the minimum water
temperature first (15°C).
Check and make sure that:
▪ The power supply to the gas
boiler is correctly wired.
▪ The communication cable
between the gas boiler and the
indoor unit is properly
mounted.
If the problem persists after you
have conducted all of the above
checks, contact your dealer.
Corrective action
(a)
Purge air from the system.
Check if is displayed on the
home pages of the user
interface. You can press to
display more information about
the malfunction.
Corrective action
Purge air manually (see "To
perform a manual air purge" on
page 71) or use the automatic air
purge function (see "To perform
an automatic air purge" on
page 71).
CHYHBH05+08AA + EHYKOMB33A
4P471761-1A – 2017.10