Rooms Are Too Hot; There Is No Hot Water; The Dhw Is Too Hot - Viessmann VITOCROSSAL 300 CU3A 35 Operating Instructions Manual

Vitocrossal 300 CU3A 26 to 199 Operating

Rooms are too Hot

Cause
H Control unit incorrectly adjusted.
H Remote control (if installed) set incorrectly.
See separate operating instructions
"Fault" is displayed, and the red fault indicator flashes.
Mixing valve motor faulty.

There is no Hot Water

Cause
The heating system is off.
H Control unit incorrectly adjusted.
H Remote control (if installed) set incorrectly.
See separate operating instructions
No fuel.
"Fault" is displayed, and the red fault indicator flashes.

The DHW is too Hot

Cause
The control unit is incorrectly adjusted.
Remedy
Check settings and correct if required:
- Operating program (refer to page 21)
- Room temperature (refer to page 21)
- Time (refer to page 30)
- Time program central heating (refer to page 21)
- Heating curve (refer to page 22)
Scan and acknowledge the type of fault (refer to page
34. If necessary, notify your heating contractor.
Adjust the mixing valves manually.
Remedy
- Switch the ON/OFF switch ON (refer to diagrams on
page 20).
- Switch ON the mains isolator, if installed (outside the
boiler room).
- Reset the fuse/MCB in the power distribution board
(main domestic fuse/ MCB).
Check settings and correct if required:
- DHW heating must be enabled (refer to page 26).
- DHW temperature (refer to page 26).
- Time program (refer to page 27).
- Time (refer to page 30).
With LPG:
Check the fuel reserves and re-order if required.
With natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
Call up and acknowledge the type of fault (refer to page
34).
Remedy
Check and correct the DHW temperature if required
(refer to page 26).
Check and correct settings, if required, at the solar
control unit.
See separate operating instructions
Troubleshooting
37