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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
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