Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 152

Troubleshooting
Repairs
(cont.)
1. Allow the Stirling engine to cool down
until the head temperature is
≤ 50 °C.
2. Remove plug A and check the
resistance values. Set resistance val-
ues: 15 Ohm ±5 %.
3. Replace resistors if necessary.
4. Remove the r.h. side panel.
Check overtravel switch connection
A
Check plug-in connection and cable to
overtravel switches A.
152
5. Undo screws and remove faulty
resistor B or C, then fit new resis-
tor.
6. Connect new resistor B or C to the
plug.
7. Insert resistor plug A into the control
unit.
A