Installation manual
44
0 EKCBX/H008BAV3
Unit for air to water heat pump system
4PW64602-1A – 09.2010
16.3. Service mode operation
Refer to the service manual to carry out any service mode operation.
17. T
ROUBLESHOOTING
This section provides useful information for diagnosing and
correcting certain problems which may occur with the unit.
This troubleshooting and related corrective actions may only be
carried out by the installer or service agent.
17.1. General guidelines
Before starting the troubleshooting procedure, carry out a thorough
visual inspection of the unit and look for obvious defects such as
loose connections or defective wiring.
When a safety device was activated, stop the unit and find out why
the safety was activated before resetting it. Under no circumstances
safety devices may be bridged or changed to a value other than the
factory setting. If the cause of the problem can not be found, call your
local dealer.
If the pressure relief valve is not working correctly and is to be
replaced, always reconnect the flexible hose attached to the pressure
relief valve, to avoid water dripping out of the unit!
17.2. General symptoms
Symptom 1: The unit is turned on (
y
LED is lit) but the unit is not
heating or cooling as expected
Symptom 2: The unit is turned on but the compressor is not starting
(space heating or domestic water heating)
Symptom 3: Pump is making noise (cavitation)
Symptom 4: The water pressure relief valve opens
DANGER: ELECTRICAL SHOCK
See "2. General Safety precautions" on page 2.
DANGER: DO NOT TOUCH PIPING AND INTERNAL
PARTS
See "2. General Safety precautions" on page 2.
DANGER
When carrying out an inspection on the control box of the
unit, always make sure that the main switch of the unit is
switched off.
For problems related to the optional solar kit for domestic
water heating, refer to the troubleshooting in the installation
manual of that kit.
DANGER
Do not touch water pipes during and immediately after
operation as the pipes may be hot. Your hand may suffer
burns. To avoid injury, give the piping time to return to
normal temperature or be sure to wear proper gloves.
WARNING
■
Do not touch the refrigerant pipes during and
immediately after operation as the refrigerant pipes
may be hot or cold, depending on the condition of the
refrigerant flowing through the refrigerant piping,
compressor, and other refrigerant cycle parts. Your
hands may suffer burns or frostbite if you touch the
refrigerant pipes. To avoid injury, give the pipes time to
return to normal temperature or, if you must touch
them, be sure to wear proper gloves.
■
Do not touch the internal parts (pump, backup heater,
etc.) during and immediately after operation.
Your hands may suffer burns if you touch the internal
parts. To avoid injury, give the internal parts time to
return to normal temperature or, if you must touch
them, be sure to wear proper gloves.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The temperature setting is not
correct.
Check the controller set point.
The water flow is too low.
• Check that all shut off valves of the
water circuit are completely open.
• Check if the water filter needs
cleaning.
• Make sure there is no air in the
system (purge air).
• Check on the manometer that there
is sufficient water pressure. The
water pressure must be >1 bar
(water is cold)
• Check that the pump speed setting is
on the highest speed.
• Make sure that the expansion vessel
is not broken.
• Check that the resistance in the
water circuit is not too high for the
pump (refer to "13.8. Setting the
pump speed" on page 30).
The water volume in the installation
is too low.
Make sure that the water volume in
the installation is above the minimum
required value (refer to
"10.2. Checking the water volume
and expansion vessel pre-pressure"
on page 18).
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The unit must start up out of its
operation range (the water
temperature is too low).
In case of low water temperature, the
system utilizes the backup heater to
reach the minimum water
temperature first (15°C).
• Check that the backup heater power
supply is correct.
• Check that the backup heater
thermal fuse is closed.
• Check that the backup heater
thermal protector is not activated.
• Check that the backup heater
contactors are not broken.
The benefit kWh rate power supply
settings and electrical connections
do not match.
If [D-01]=1 or 2, the wiring requires
specific installation like illustrated in
"Connection to a benefit kWh rate
power supply" on page 24. Other
correctly installed configurations are
possible, but are to be specific for
the type of benefit kWh rate power
supply type at this specific site.
The benefit kWh rate signal was sent
by the electricity company.
Wait for the power to return.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
There is air in the system.
Purge air.
Water pressure at pump inlet is too
low.
• Check on the manometer that there
is sufficient water pressure. The
water pressure must be >1 bar
(water is cold).
• Check that the manometer is not
broken.
• Check that the expansion vessel is
not broken.
• Check that the setting of the pre-
pressure of the expansion vessel is
correct (refer to "10.3. Setting the
pre-pressure of the expansion
vessel" on page 19).
P
OSSIBLE
CAUSES
C
ORRECTIVE
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 under the
maximum allowed value (refer to
"10.2. Checking the water volume
and expansion vessel pre-pressure"
on page 18).
4PW64602-1A.book Page 44 Thursday, September 23, 2010 10:40 AM
