MTD -ERV 350 User Manual
Page 47
4
43
Instructions 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
e
r
u
s
a
e
m
/
k
c
e
h
C
e
s
u
a
C
All OFF
Supply voltage
Check the fuse on the PCB panel.
• If the fuse is OK, the circuit board is defec-
tive.
.
d
e
li
a
f
s
a
h
y
l
p
p
u
s
r
e
w
o
p
s
n
i
a
m
e
h
T
e
g
a
tl
o
v
y
l
p
p
u
s
o
N
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.