Repairs - Viessmann Vitopend 100-W Installation And Service Instructions Manual

Troubleshooting
Fault messages on the display
Displayed System characteris-
fault code tics
F58 No DHW heating
F59 No DHW heating

Repairs

Checking and cleaning the plate heat exchanger
Shut off and drain the boiler on the heating water and DHW sides.
Note
Residual water may drain from the plate heat exchanger.
38
(cont.)
Cause
Lead break, cylin-
der temperature
sensor (gas sys-
tem boiler)
Lead break, outlet
temperature sen-
sor (gas combi
boiler)
Measures
Check the sensor (see
page 40).
Check the sensor (see
page 40).