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 Multimeter to Ohm range "Ω" or "
)
)
)
) " 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 Ω)
Triac short circuit
Change new
No signal "OL" or (
Ω)
Triac Pass
No action
Check
Meter Result
Cause
Action
L1 - GRD
"Beep" signal or (~ 0 Ω)
Triac short circuit
Change New
Triac PCB
No signal "OL" or (
Ω)
Triac Pass
No action
H1- GRD
"Beep" signal or (~ 0 Ω)
Triac short circuit
Change New
Triac PCB
No signal "OL" or (
Ω)
Triac Pass
No action
Remark: "OL" = Over Load for Digital Multimeter, "
Ω" = Over Load for Analog Multimeter
GRD
L1
H1
GRD
H1
L1
GRD
Poles - Ground