MTD -ERV 350 - Manual (Page 44)

4
40 Instructions for the Installer
A1 / A2 / A3 / A4
Temperature sensor malfunction
T1 / T2 / T3 / T4
Remove the plug from
the socket
Remove the filter, the plastic
front cover and the metal cover
Remove temperature
sensor from the PCB
Check temperature sensor
resistance; see table
Is resistance OK? Yes No
Replace the PCB
CAUTION: Reset unit!
Replace the
temperature sensor
CAUTION!
Avoid contact with the
PCB and frost protection
element due to risk of
electrocution
A5 / A6
Motor bypass / frost protection element
malfunction
Remove the filter,
the plastic front cover and
the metal cover
Then initiate the
self-test (P76 on 1)
Is the motor
running?
Yes No
Remove the motor and
the cog (incl. plastic part)
Is the cog defective? No
Replace motor
Check connection and PCB;
12 VDC if motor is
running (see menu P76)
Does the
PCB register
current?
Yes
Replace motor
Yes
Replace cog
No
Replace the PCB
CAUTION: Reset unit!
Temp Resistance [K!]
oC
MIN MED MAX
10 19.570 19.904 20.242
15 15.485 15.712 15.941
18 13.502 13.681 13.861
19 12.906 13.071 13.237
20 12.339 12.491 12.644
21 11.801 11.941 12.082
22 11.291 11.420 11.550
25 9.900 10.000 10.100
30 7.959 8.057 8.155
[°C] [K Ω