Viessmann VITOPEND 100-W Installation And Service Instructions Manual page 34

10.5 to 24 kw and 13 to 30 kw. gas fired central heating and combi boilers for open flue operation. natural gas and lpg version
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Troubleshooting
Repairs
Checking and cleaning the plate-type heat exchanger
Shut off and drain the boiler on its heating water and DHW side.
Note
Residual water may be expelled by the plate-type heat exchanger.
Remove outlet temperature sensor A.
A Outlet temperature sensor
B Screws
34

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