
18
Air 70 Rev. D
Fault code
(blinking
red LEDs)
Cause
Action appliance
Action installer
Preheater
Appliance keeps running, fan
speed goes down
Take the voltage from the appliance
Check preheater wiring
Replace wiring or preheater
Put voltage back on appliance
Fault has automatically been reset
CO
2
sensor
Appliance keeps running
CO
2
control system deactivated
Take the voltage from the appliance
Check sensor wiring
Replace wiring or sensor
Put voltage back on appliance
Fault has automatically been reset
Humidity sensor
Appliance keeps running
RH control system deactivated
Take the voltage from the appliance
Check sensor wiring
Replace wiring or sensor
Put voltage back on appliance
Fault has automatically been reset
Plus pcb defective
(locking fault)
Fan is switched off
Preheater is switched off
If applicable, the Bypass is shut
off and blocked
Take the voltage from the appliance
Check connection Plus pcb
Replace the Plus pcb
Put voltage back on appliance
Fault has automatically been reset
14-pole connector X5 not
connected
Appliance is not working
Take the voltage from the appliance
Place the 14-pole connector on X5
(see 9.1)
Put voltage back on appliance
Fault has automatically been reset
4-way switch
closure between terminals
Appliance keeps running on
position
1
Take the voltage from the appliance
Check connection 4-way switch
Replace if necessary 4-way switch
Put voltage back on appliance
Fault has automatically been reset
Chapter 7 Fault
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