Viessmann AirflowPLUS AH2A-213 Installation, Service And Operating Instruction page 47

Viessmann AirflowPLUS AH2A Installation, Operating and Service
Troubleshooting
Power is on at the air handler
for more than 24 hours.
The alarm buzzer is on.
The red housing mounted
LED is illuminated after
5 minutes of power on.
The housing mounted LED will
flash an error code. Record
colors and number of flashes
(5 cycles/min). Refer to chart
on page 42 for identification.
If 8 red flashes followed by
8 red flashes repeats after
a specific sensor, then
replace that sensor.
Note: the alarm buzzer can be
silenced for 24 hours by
cycling the power to the
air handler OFF then ON.
(continued)
Yes
Yes
Yes
Continue
Continue
Temperature sensor failure identification
Temperature sensor failure is identified by viewing the
housing mounted LED.
No
Service
47