Locking Out The Controls (Key Lock); Temporarily Interrupting Or Unlocking Key Lock; Changing The Display Format Of Fault Messages; Returning All Settings To Their Delivered Condition - Viessmann OpenTherm VITOTROL 100 OT Operating Instructions For The System User

Locking out Controls (Key Lock)
You can lock out the controls by switching on key lock.
1. Confirm "KEY LOCK" with OK
2. Use +/- to select "WITH KEY LOCK" or "NO KEY LOCK"
3. OK to confirm
The display then shows only "KEY LOCK" and a key symbol

Temporarily Interrupting or Unlocking Key Lock

Press and hold INFO for longer than 3 seconds.
You can temporarily operate the device or unlock the key lock. See above.

Changing the Display Format of Fault Messages

1. Press OK to confirm the "ERROR FORMAT"
2. Use +/- to select "HEXADECIMAL"
Do not adjust "DECIMAL"
3. OK to confirm

Returning All Settings to Their Delivered Condition

All settings made after commissioning will be lost.
1. Confirm "FACTORY SET" with OK
"CONFIRM" appears
2. OK to confirm

Possible Problems

System Characteristics Cause
Rooms are too cold
Rooms are too hot

Carrying Out a Reset

Press the reset button with a suitable instrument.
The room temperature is set
incorrectly
The room temperature is set
incorrectly
Further Adjustments & Possible Problems
Remedy
Check the settings and correct if
required:
• Program (see pages 6 - 7)
• Room Temperature (see pages
8 - 9)
• Time (see page 14)
Check the settings and correct if
required:
• Program (see pages 6 - 7)
• Room Temperature (see pages
8 - 9)
• Time (see page 14)
15