Samsung DMT300 Series Service Manual page 37

Error type Error mode
Error type Error mode
High 'Normal' +
Temperature "Quick' LED
Heating Error
Leakage Error 'Heavy' LED
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Checking Method
3) Check the connections of the Heater Relay.
: Check the voltage between the red wire of the Heater Relay on the base
and the yellow and amber wires of the Power Relay.
• Normal: 120V (while operating)
4) Check the driving signals for the Heater Relay
• Measure the voltage between pin 6 (amber) of the Main PBA CN302
connector and pin 2 (red) of the CN302 connector.
• When the Heater is off: 9.5 to 12.5V
• When the Heater is operating: < 0.5V
Checking Method
1) Check the hot water connections for the Inlet Valve.
2) Check the operation of the Thermistor.
Check whether there is any trace of water leakage in the shutter.
• Normal: No water leakage trace
Corrective actions
Reconnect the Heater Relay connectors.
•
P owe r Re la y He a te r Re la y
ye llow + a mbe r re d wire
wire conne ctor conne ctor
Faulty: Replace the Main PBA assy
•
• Normal: Replace the Heater Relay.
• Remove Retainer.
Check voltage
Corrective actions
• See the "Temperature Sensor Error".
• See the "Heater Error".
Faulty: Check the leakage location. Replace the faulty part.
•
• Replace the Main PBA assy.
4. Troubleshooting
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