STIEBEL ELTRON AQ 35 E-2 - TRIAC Checking

9
2. TRIAC Checking
Definition: The Triac is a three-terminal device, which controls and conducts current flow during
both alternations of an AC cycle. To check Single Triac, follow the steps below:
- Disconnect cables and unplug any connectors in red circle.
- Set Mu)))) " and check as show in the pictures.
Note; L1 = line, H1 = Heater, GRD = Ground
Check
Meter Result
Cause
Action
L1  H1
"Beep" signal or (~ 0 )
Triac short circuit
Change new
No signal "OL" or ( 
Triac Pass
No action
Check
Meter Result
Cause
Action
L1 - GRD
"Beep" signal or (~ 0 )
Triac short circuit
Change New Triac PCB
No signal "OL" or ( 
Triac Pass
No action
H1- GRD
"Beep" signal or (~ 0 )
Triac short circuit
Change New Triac PCB
No signal "OL" or ( 
Triac Pass
No action
Remark: "OL" = Over Load for Digital Multimeter, " r
GRD
L1
H1
GRD
H1
L1
GRD
Poles - Ground