Elma T820H - 6.2 T420(H); LC20 H

Trouble shooting / List of malfunctions
© Elma GmbH & Co KG SM/Transsonic_LC/1104/D
13
6.2 T420(H); LC20H
Malfunction 1. Check:
pilot lamp
ultra-
sound
2. Check:
heating
switch
- if lighted
3. Check:
fuse
printed
board
Possible causes Remedy
Check the unit for possible damages and traces of liquid inside (e.g. leak in the
tank, liquid/humidity entering from outside)
No ultrasound /
weak ultrasound
(Heating OK)
OK OK OK
• output
transformer
• output
capacitor
• scorching in
transducer
system
• replace
component
• replace
complete printed
board
• open/check
transducer
system
No ultrasound
(Heating OK)
OFF OFF faulty
• faulty printed
board (BZW
diode;
transistors;
diodes)
• short circuit in
heating
disconnect
heating cable;
check again)
• replace
component
• replace
complete printed
board
• replace heating
No ultrasound
(Heating OK)
OFF OK OK
• interference
filter coil
• timer
• replace
component
• replace
complete
interference
filter
No ultrasound
(Heating OK)
OFF OFF OK
• interference
filter
• mains cable
• replace
complete
interference
filter
• replace mains
cable
No heating;
No ultrasound
OFF OFF OK
• scorched
interference
filter
• faulty mains
cable
• replace
complete printed
board
• replace mains
cable