13 Troubleshooting
Installer reference guide
82
RVLQ05+08CAV4 + RHYHBH05AA + RHYHBH/X08AA +
RHYKOMB33AA
ROTEX HPU hybrid
4P355635-1 – 2013.05
Possible causes Corrective action
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
"10.3.1 To perform a manual
air purge" on page 75) or use
the automatic air purge
function (see "10.3.2 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 "16.7 ESP
curve" on page 112).
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.
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
"6.3.3 To check the water
volume" on page 17).
13.3.2 Symptom: The compressor does NOT
start (space 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 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.
The preferential kWh rate power
supply settings and electrical
connections do NOT match
This should match with the
connections as explained in
"6.4.1 About preparing electrical
wiring" on page 18 and "7.8.4 To
connect the main power supply
of the indoor unit" on page 34.
The preferential kWh rate signal
was sent by the electricity
company
Wait for the power to return (2
hours max.).
13.3.3 Symptom: The pump is making noise
(cavitation)
Possible causes Corrective action
There is air in the system Purge air manually (see
"10.3.1 To perform a manual air
purge" on page 75) or use the
automatic air purge function (see
"10.3.2 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 pressure sensor of the
gas boiler is not broken.
▪ The expansion vessel is not
broken.
▪ The pre-pressure setting of the
expansion vessel is correct
(see "6.3.4 Changing the pre-
pressure of the expansion
vessel" on page 18).
13.3.4 Symptom: The pressure relief valve opens
Possible causes Corrective action
The expansion vessel is broken Replace the expansion vessel.
The water volume in the
installation is too high
Make sure that the water volume
in the installation is below the
maximum allowed value (see
"6.3.3 To check the water
volume" on page 17 and
"6.3.4 Changing the pre-pressure
of the expansion vessel" on
page 18).
The water circuit head is too high The water circuit head is the
difference in height between the
indoor unit and the highest point
of the water circuit. If the indoor
unit is located at the highest
point of the installation, the
installation height is considered
0 m. The maximum water circuit
head is 7 m.
Check the installation
requirements.
13.3.5 Symptom: The water pressure relief valve
leaks
Possible causes Corrective action
Dirt is blocking the water
pressure relief valve outlet
Check whether the pressure
relief valve works correctly by
turning the red knob on the valve
counterclockwise:
▪ If you do NOT hear a clacking
sound, contact your dealer.
▪ If the water keeps running out
of the unit, close both the
water inlet and outlet shut-off
valves first and then contact
your dealer.
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