38
12.2 WHR Malfunctions List
Complaint/malfunction Indications
Display
Inspection
No complaint
Bypass running
Bypass
Filter soiled
FiLtEr/A1
Filter
Bypass does not run
Bypass
A3
PTC sensor intake in
A4
PTC sensor exhaust in
E3
PTC sensor exhaust out
flashing A5
A5
Set "P52" to "0"
flashing A7
A7
Set "P53" to "0"
All off
Power on
Board fuse defective
Main board defective
No power supply
Power cut
High intake air temperature during summer
Bypass remains closed
Bypass
A3
PTC sensor intake in
A4
PTC sensor exhaust in
Low intake air temperature during winter
Bypass remains open
Bypass
E3
PTC sensor exhaust out
Little or no intake air
Fan not running
E2
Fan defective
E2
Fan board defective
Main board
E3
PTC sensor
Fan running
Filters blocked
Valves blocked
Exchanger blocked by dirt
Exchanger frozen shut
PTC sensor deviation
Main board
Fan soiled
Ventilation ducts blocked
Intake reduced due to frost hazard
Supply deactivated due to extreme frost hazard
Little or no exhaust air
shower stays wet too long
Fan not running
E1
Fan defective
E1
Fan board defective
Main board defective
Fan running
Filters blocked
Valves blocked, hood blocked
Exchanger blocked
Fan soiled
Ventilation ducts blocked
Too much noise
Supply or exhaust fan
E1/E2
Motor defective
Bearings defective
Fan runs at excessive rate. Little
or no intake and exhaust air.
Bypass
Bypass valve stuck
Bypass motor defective
Sucking sound
Siphon does not close/siphon empty
Whistling sound
Air leak somewhere
Airflow sound
Valves insufficiently opened
Valves do not connect to the duct
Fan runs at excessive rate. Little or no intake and exhaust
air
Condensation leak
Check that connections are correct; see §8
Condensation drain blocked
Condensation drain duct does not run into drip tray
Three-position switch does not work
Switch (installation) Three-position switch.
Main board
E1/E2
Fan
English