User Manual

Error display

Permanent display: Communication with BMU incorrect or

REA23M is not placed on its base.

Flashing display: BMU reports an error

Flashing display: BMU reports an error and writes its

error code on display.

(automatic display, can not be

suppressed manually)

Error in transmission of relative modulation level

°C

4/14

Building Technologies Room temperature controller REA23M CE1N2217en

Error in transmission of flow temperature or

sensing element for flow temperature defect

Error in transmission of outside temperature or

sensing element for flow temperature defect

Error in transmission of D.H.W. setpoint

Error is being displayed latest 2 minutes after error occurs.

Selection of operating mode (only one operating mode is active)

priority for actual valid temperature setpoint)

Automatic mode

Comfort mode

Economy mode

Frost protection

24-hour mode with one heating period

(heating period is automatically generated from the current

24-hour program)

Temporary change of the current setpoint temperature

(change only active until the next switching point is reached)

° C

When pressing the + or – button once, the adjusted setpoint

temperature will be displayed. It can be readjusted in incre-

ments of 0.2 °C (max. +/- 4 °C).

Override button

In operating modes and , this button can be used to switch from com-

fort to economy temperature, or vice versa. The selection is maintained until the

next switching point is reached or until the operating mode is changed.

priority for actual valid temperature setpoint)

HVAC Products 17.04.2007