Samsung DMR78AHS/XAC Service Manual page 57

Error type Error mode
Power Relay error None
4-19
Checking Method
1. Check the connections for the Power Relay
connector:
: Start the cycle by pressing the Power key.
Then measure the operating voltage between the
black wires of the Heater Relay, and the operating
voltage between the yellow and amber wires of the
Power Relay.
Caution
Check the color of the wires of the Power Relay
and the Heater Relay.
Normal: 120V
➢
2. Check the door switch.
: Check the white wire and the switch connected to
the white wire.
When the door is open
➢
: The Door Switch is OFF.
When the door is closed
➢
: The Door Switch is ON.
 The Power Relay and the Heater Relay use a 12V
line. If the switch is out of order, the Power Relay
and the Heater Relay will not operate.
Corrective actions
- Reconnect the Power Relay.
Power Relay Terminal
(Yellow wire + Amber wire)
- Faulty: Replace the Door Switch.
4. Troubleshooting
Heater Relay Terminal
(Black wire + Black wire)