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43Instructions for the Installer
4.7.3 Malfunctions (or Problems) without Indications
This section gives an overview of the malfunctions (or problems) that are not displayed on the CC Ease display.
Problem/Malfunction erusaem / kcehCesuaC
All OFF Supply voltage Check the fuse on the PCB panel.
• If the fuse is OK, the circuit board is defec-
tive.
.deliaf sah ylppus rewop sniam ehTegatlov ylppus oN
High air delivery tem-
perature in summer
Bypass remains closed Lower
the comfort temperature.
Low air delivery tem-
perature in winter
Bypass remains open Increase
the comfort temperature.
No or insuffi cient air
supply, shower re-
mains wet
Filter clogged Replace
the fi lters.
Valves clogged Clean
the valves.
Heat exchanger clogged by dirt. Clean
the heat exchanger.
Heat exchanger frozen Thaw
the heat exchanger.
Fan dirty Clean
the fan.
Ventilation ducts clogged Clean
the ventilation ducts.
MTD-ERV 350 in frost mode
Too noisy Fan bearings defective Replace
the fan bearings.
Fan settings Change
the ventilation control settings.
Scraping noise
• Siphon is empty
• Siphon does not seal
Install
the siphon again.
Whistling noise
• An air leak somewhere in the system
Seal
the air leak.
Air fl ow noises
• Valves do not seal against duct.
• Valves not suffi ciently open
Install
the valves again.
Set
the valves again.
Leaking condensation Condensation drain clogged Clean
the condensation drain.
Condensation from exhaust duct does not
run into drain plate
Check whether
the connections are correct.
Wired 3-position
switch does not func-
tion
Wiring is not OK Check the circuitry of the 3-position switch
using a voltmeter:
• Voltage only on N & L3:
[The fans run at position 1].
• Voltage only on N & L3 & L2:
[The fans run at position 2].
• Voltage only on N & L3 & L1 or N & L3 & L2
& L1:
[The fans run at position 3].
Switch is defective
Wireless 3-position
switch does not func-
tion
Battery is discharged Check
the battery.
• Replace the battery, if necessary.