Vaillant 0010015166, Installation And Maintenance Instructions Manual

Page: 21 / 28

Appendix
0020159949_07 recoVAIR Installation and maintenance instructions
21
Message Possible cause Measure
F.812 Failure: Exhaust air
temp. sensor Exhaust-air temperature sensor
does not work/is defective
▶
Check that the exhaust-air temperature sensor works correctly.
F.813 Exh. air ventilator un-
der-dimensioned Incorrect fan specification
▶
Check the fan connection, the fan size (up to 260 m
3
/h or
360 m
3
/h) and the fan power.
F.814 Supply air ventilator
under-dimensioned Incorrect fan specification
▶
Check the fan connection, the fan size (up to 260 m
3
/h or
360 m
3
/h) and the fan power.
F.815 Fault: Frost prot. ele-
ment Exhaust-air humidity sensor
does not work/is defective
▶
Check that the exhaust-air humidity sensor works correctly.
F.816 Ventilator connection
inverted Fan connection incorrect/fan
incorrectly connected/installed
▶
Check the fan connections.
C Limp home mode messages
–
Overview
Message Possible cause Measure
Lhm.801 Failure: Exh. air
temp. sensor Exhaust-air temperature sensor
does not work/is defective
▶
Check that the exhaust-air temperature sensor works correctly.
Lhm.802 Failure: Exit air
sensor Exit-air temperature sensor
does not work/is defective
▶
Check that the exit-air temperature sensor works correctly.
Lhm.803 Failure: Supply
temp. sensor Supply-air temperature sensor
does not work/is defective
▶
Check that the supply-air temperature sensor works correctly.
Lhm.804 Failure: Outside air
temp. sensor Outside temperature sensor
does not work/is defective
▶
Check that the outside temperature sensor works correctly.
Lhm.805 Failure: Exhaust air
humidity sensor Exhaust-air humidity sensor
does not work/is defective
▶
Check that the exhaust-air humidity sensor works correctly.
Lhm.806 Supply air temp. too
low Frost protection active
▶
Wait until the supply-air temperature increases again. The
product then starts normal operation.
Supply air temp.: > 10
℃
Lhm.807 Failure/fault: Air
quality sensor Air quality sensor does not
work/is defective
▶
Check the air quality sensors.
Lhm.810 No connection to
step switch 4-step switch does not work/is
defective 1. Activate the 4-step switch in the installer level.
2. Check that the 4-step switch works correctly.
Lhm.811 Failure of the supply-
air differential pressure sensor
Supply-air differential pressure
sensor does not work/is defect-
ive
▶
Check that the supply-air differential pressure sensor works
correctly.
Lhm.812 Failure of the exit-air
differential pressure sensor
Exit-air differential pressure
sensor does not work/is defect-
ive
▶
Check that the exit-air differential pressure sensor works cor-
rectly.
Lhm.815 Supply air target vol.
flow not achieved Incorrect fan specification
▶
Check the fan connection, the fan size (up to 260 m
3
/h or
360 m
3
/h) and the fan power.
Lhm.816 Exit air target vol.
flow not achieved Incorrect fan specification
▶
Check the fan connection, the fan size (up to 260 m
3
/h or
360 m
3
/h) and the fan power.
Lhm.817 Failure: Frost prot.
element The frost protection element is
defective
▶
Replace the frost protection element.
D Troubleshooting
Symptom Possible cause Measure
Product not operating The mains voltage has been
interrupted/power cut
▶
Wait until the mains voltage has been re-established and the
product automatically switches on (all settings are retained).
Frost protection active (mains
voltage present) 1. Check whether S.815 is displayed in the Live Monitor .
2. Wait until the outside temperature increases (the product
automatically switches on no later than 60 minutes after the
temperature increases.).
–
Outside temperature: >
−
3
℃
Product with increased noise
level Missing/incorrect silencer in the
supply-air exhaust-air pipes
▶
Install silencers in accordance with the system planning.
System components (e.g. heat
exchanger, fan) are defective
▶
Replace defective system components.