Daikin EUWY-KBZW1 handleiding

Airco

Daikin

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Handleiding

Installation and operation manual
19
EUWY(*)5~24KBZW1
Packaged reversible air to water heat pumps
4PW61655-1 – 07.2010
TROUBLESHOOTING
This section provides useful information for diagnosing and
correcting certain troubles which may occur in the unit.
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.
Before contacting your local dealer, read this chapter carefully, it will
save you time and money. 
When a safety device was activated, stop the unit and ﬁnd out why
the safety device 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 cannot be
found, call your local dealer.
Symptom 1: The unit does not start, but the L LED lights up
Symptom 2: The unit does not start, but the 
L LED is ﬂashing
Symptom 3: The unit does not start and the 
L LED does not light up
Symptom 4: One of the following safety devices is activated
When carrying out an inspection on the switch box of the
unit, always make sure that the main switch of the unit is
switched off.
POSSIBLE CAUSES CORRECTIVE ACTION
The temperature setting is not 
correct.
Check the controller setpoint.
Power supply failure. Check the voltage on the supply 
panel.
Blown fuse or interrupted protection 
device.
Inspect fuses and protection 
devices. Replace by fuses of the 
same size and type (refer to chapter 
"Electrical speciﬁcations" on 
page 4).
Loose connections. Inspect connections of the ﬁeld 
wiring and the internal wiring of the 
unit. Tighten all loose connections.
Shorted or broken wires. Test circuits using a tester and repair 
if necessary.
POSSIBLE CAUSES CORRECTIVE ACTION
The ﬂowstart timer is still running. The unit will start after approx. 15 
seconds. Make sure the water is 
ﬂowing through the evaporator. 
The remote ON/OFF input is 
enabled and the remote switch is off.
Put the remote switch on or disable 
the remote ON/OFF input.
The anti-recycling timer is still active. The cicuit can only start up after 
approximately 4 minutes.
The guard timer is still active. The circuit can only start up after 
approximately 1 minute.
POSSIBLE CAUSES CORRECTIVE ACTION
One of the following safety devices is 
activated:
•Reverse phase protector
•Overcurrent relay (K*S)
• Discharge thermal protector (Q*D)
•Evaporating temperature
Thermostat (S*T)
• Flow switch (S10L)
• High pressure switch (S*HP)
Check on the controller and refer to 
symptom 4 "One of the following 
safety devices is activated" on 
page 19. Refer to the explanation of 
the digital controller in the chapter 
"Resetting alarms" on page 13.
The unit is in anti-freeze alarm. Check on the controller and refer to 
symptom 4 "One of the following 
safety devices is activated" on 
page 19. Refer to the explanation of 
the digital controller in the chapter 
"Resetting alarms" on page 13.
The remote ON/OFF input is 
enabled and the remote switch is off.
Put the remote switch on or disable 
the remote ON/OFF input.
The keyboard is locked. The user 
parameter  h09 is set to 0.
Unlock the controller keyboard.
Symptom 4.1:  Overcurrent relay of compressor
POSSIBLE CAUSES CORRECTIVE ACTION
Failure of one of the phases. Check fuses on the supply panel or 
measure the supply voltage.
Voltage too low. Measure the supply voltage.
Overload of motor. Reset. If the failure persists, call your 
local dealer.
RESET Push the red button on the over-
current relay inside the switch box. 
The controller still needs to be reset.
Symptom 4.2:  Low pressure switch or anti-freeze alarm
POSSIBLE CAUSES CORRECTIVE ACTION
Water ﬂow to water heat exchanger 
too low.
Increase the water ﬂow.
Shortage of refrigerant. Check for leaks and reﬁll refrigerant, 
if necessary.
Unit is working out of its operation 
range.
Check the operation conditions of 
the unit.
Inlet temperature to the water heat 
exchanger is too low.
Increase the inlet water temperature.
Flow switch is not working or no 
water ﬂow.
Check the ﬂow switch and the water 
pump.
RESET After pressure rise, the low pressure 
switch resets automatically, but the 
controller still needs to be reset.
Symptom 4.3:  High-pressure switch
POSSIBLE CAUSES CORRECTIVE ACTION
Condenser fan does not operate 
properly in cooling mode.
Check that the fans turn freely. Clean 
if necessary.
Water ﬂow through water heat 
exchanger is too low in heating 
mode.
Increase the water ﬂow.
Dirty or partially blocked condenser. Remove any obstacle and clean 
condenser coil using brush and 
blower.
Inlet air temperature of the 
condenser is too high.
The air temperature measured at the 
inlet of the condenser may not 
exceed 43°C.
Outlet water temperature of the 
condenser in heating mode is too 
high.
The water temperature measured at 
the outlet of the condenser may not 
exceed 25°C.
RESET After pressure decrease, the high 
pressure switch resets automatically, 
but the controller still needs to be 
reset.
Symptom 4.4:  Fan thermal protector is activated
POSSIBLE CAUSES CORRECTIVE ACTION
Mechanical failure (fan is blocked). Check that the fan rotates freely.
Air ﬂow in the unit too low or outdoor 
temperature too high.
Clean the air heat exchanger 
properly.
RESET After temperature decrease, the 
thermal protector is reset 
automatically.
If the protector is activated 
frequently, replace the motor or call 
your local dealer.
Symptom 4.5:  Reverse phase protector is activated
POSSIBLE CAUSES CORRECTIVE ACTION
Two phases of the power supply are 
connected in the wrong phase 
position.
Invert two phases of the power 
supply (by licensed electrician).
One phase is not connected 
properly.
Check the connection of all phases.
RESET After inverting two phases or ﬁxing 
the power supply cables properly, 
the protector is reset automatically, 
but the controller still needs to be 
reset.

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