Technical Information
34
T 980x/T 982x
4. Check the function of the exhaust air duct and the fan.
5. Check the flame sensor (B1/16) for continuity (at room temperature).
Danger!
Danger of high voltage when working on the appliance while it's opened.
Components carry voltage.
6. Start the drying program.
7. Check if the heater relays (1K1/1) and (2K1/1) close.
8. Check if the maintaining coil and the booster coil of gas solenoid Y57/1
are receiving voltage, and if the gas solenoid opens audibly.
Note: No gas flow since gas solenoid Y57/2 is closed.
Figure 031-6: Port for Measuring Jet Pressure
9. Check that no gas flows out, and measure the gas-tapping pressure;
refer to Figure 031-6.
10. Check if igniter electrode E1/1 carries voltage and starts glowing.
11. With igniter electrode E1/1 red-hot, check if flame sensor B1/16 opens.
12. Now check if gas solenoid valve Y57/2 receives voltage via low-ohmic
igniter electrode E1/1 and opens. For jet pressure, refer to Figure 031-6.
13. Check if gas solenoid Y57/1 continues to be open via the maintaining coil
of the gas solenoid.
14. With the flame gone out, check if gas solenoid Y57/2 closes flame sensor
B1/16 within the safety time and shuts off the gas stream. For safety time,
refer to Section 031-2.1.3.
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