Slide switch controller
KWL-BE
Operating instructions
4
EN
Faults
Note
Cause
Solution
Information
Info 1
Filter change
Filter dirty
Change filter
Info 2
Frost protection Heat exchanger
Cold outside temperature
for info, turns off automatically in war-
mer temperatures
Info 3
SD card error
SD card inserted incorrectly / defective
Have SD card tested by specialist
Info 4
Failure of an external module
Cable break,
programmed but unavailable
Have programming and connection to
KWL-EM tested by specialist
Error messages
Error 1
Speed error “Supply air” fan (outside air)
Target speed is not reached in terms of
ventilation
Check air ducts for obstructions (dirty
grille/filter, incorrectly installed
valves,...)
Software error
Reset (electricity off/on)
Cable break
Connect cable correctly
Motor/impeller defective
Replace motor/impeller unit
Error 2
Speed error “Extract air” fan (exhaust air)
Like “Error 1” (see above)
Like “Error 1” (see above)
Error 3
-free-
–
–
Error 4
SD card error when writing
Internal error
Reset (electricity off/on)
Error 5
Bus overcurrent
Too many subscribers connected to bus
Error 6
-free-
–
–
Error 7
BASIS VHZ EH voltage to heat module not available
Electronic error
Reset (electricity off/on)
Error 8
Ext. module (VHZ) mains voltage to KWL-EM unavailable
EM module pre-heater with no power
Connect/switch on power
Error 9
Ext. module (NHZ) mains voltage to KWL-EM unavailable
EM module auxiliary heater with no power
Connect/switch on power
Error 10
BASIS Int. temp sensor (T1) -outside air- (missing or cable break)
Temp. sens. not sending signal to circ. board Connect temperature sensor correctly
Error 11
BASIS Int. temp sensor (T2) -supply air- (missing or cable break)
Temp. sens. not sending signal to circ. board Connect temperature sensor correctly
Error 12
BASIS Int. temp sensor (T3) -extract air- (missing or cable break)
Temp. sens. not sending signal to circ. board Connect temperature sensor correctly
Error 13
BASIS Int. temp sensor (T4) -exhaust air- (missing or cable break)
Temp. sens. not sending signal to circ. board Connect temperature sensor correctly
Error 14
BASIS Int. temp sensor (T1) -outside air- (short-circuit)
Short-circuit in sensor cable
Connect temperature sensor correctly
Error 15
BASIS Int. temp sensor (T2) -supply air- (short-circuit)
Short-circuit in sensor cable
Connect temperature sensor correctly
Error 16
BASIS Int. temp sensor (T3) -extract air- (short-circuit)
Short-circuit in sensor cable
Connect temperature sensor correctly
Error 17
BASIS Int. temp sensor (T4) -exhaust air- (short-circuit)
Short-circuit in sensor cable
Connect temperature sensor correctly
Error 18
Ext. module configured as VHZ but not available or malfunction
Pre-heater programmed, but corresponding
EM module not connected
Reprogramme pre-heater or configure
KWL-EM as pre-heater
Error 19
Ext. module configured as NHZ but not available or malfunction
Auxiliary heater programmed, but correspon-
ding EM module not connected
Reprogramme auxiliary heater or confi-
gure KWL-EM as pre-heater
Error 20
Ext. module (VHZ) duct sensor (T5) -outside air- (missing or cable break)
Temp. sens. not sending signal to circ. board Connect temperature sensor correctly
Error 21
Ext. module (NHZ) duct sensor (T6) -supply air- (missing or cable break)
Temp. sens. not sending signal to circ. board Connect temperature sensor correctly
Error 22
Ext. module (VHZ) duct sensor (T7) –return WW register- (missing or cable
break)
Temp. sens. not sending signal to circ. board Connect temperature sensor correctly
Error 23
Ext. module (VHZ) duct sensor (T5) -outside air- (short-circuit)
Short-circuit in sensor cable
Connect temperature sensor correctly
Error 24
Ext. module (NHZ) duct sensor (T6) -supply air- (short-circuit)
Short-circuit in sensor cable
Connect temperature sensor correctly
Error 25
Ext. module (NHZ) duct sensor (T7) –return WW register- (short-circuit)
Short-circuit in sensor cable
Connect temperature sensor correctly
Error 26
Ext. module (VHZ) safety limiter automatically triggered
Pre-heater coil has overheated!
Bridge not connected or missing
System automatically resets itself after
cooling
Find cause of overheating
(volume flow too low,..)
Error 27
Ext. module (VHZ) safety limiter manually triggered
Pre-heater coil has overheated!
Bridge not connected or missing
Reset (electricity off/on)
Find cause of overheating
(volume flow too low,..)
Error 28
Ext. module (NHZ) safety limiter automatically triggered
Auxiliary heater coil has overheated!
Bridge not connected or missing
Auto. system reset after cooling
Find cause of overheating
(volume flow too low,..)
Error 29
Ext. module (NHZ) safety limiter manually triggered
Auxiliary heater coil has overheated!
Bridge not connected or missing
Reset (electricity off/on)
Find cause of overheating
(volume flow too low,..)
Error 30
Ext. module (NHZ) Frost protection measured by WW return (T7)
(switching threshold adjustable e.g. < 7 °C)
Return temperature too low
Check flow temperature, increase if ne-
cessary, outside temperature too cold
Error 31
Ext. module (NHZ) Frost protection measured by supply air sensor (T6)
(switching threshold adjustable e.g. < 7 °C)
Supply air temperature too low
Check flow temperature, increase if ne-
cessary, outside temperature too cold
Error 32
Frost protection external WW reg (fixed < 7 °C only PHI) measured either
by (1.) Ext. module (NHZ) supply air duct sensor (T6)
by (2.) BASIS supply air duct sensor (T2)
Supply air temperature too low
Check flow temperature, increase if ne-
cessary, outside temperature too cold
2.3 Fault overview