Troubleshooting without the display. Bosch Greenstar 131

TROUBLESHOOTING - FW 100

8.2

TROUBLESHOOTING WITHOUT THE DISPLAY

Fault

Required room temperature not achieved.

Excessive room temperature fluctuations.

Temperature rises instead of falling.

Room temperature too high during

“Economy” and/or

“Frost” mode.

Incorrect or no control.

Controller can only be set to automatic mode.

Domestic hot water cylinder does not heat up.

Cause

Thermostatic valve(s) set too low.

Minimum outside temperature setting too low.

Heating curve set too low.

Flow temperature controller on the boiler set too low.

Air in the heating system.

Room temperature offset set incorrectly

Remedy

Set thermostatic valve(s) higher.

Adjust minimum outside temperature setting.

Heating up takes too long.

Flow temperature from boiler too low, radiators too cool.

Required room temperature greatly exceeded.

The boilers holiday function is active.

“Heating up speed” set too low.

Minimum outside temperature setting too low.

Radiators become too hot.

FW 100 installed in an unfavourable location, e.g. external wall, near windows, in a draught,

Room temperature offset set incorrectly

Adjust minimum outside temperature setting.

Set thermostatic valve(s) lower.

“Heating levels” for “Comfort” or ask your installer to correct heating curve.

Select a better location for FW 100 and ask your heating engineer to reposition it.

Temporary influence of external heat on the room, e.g. through solar radiation, lighting,

TV, fireplace etc.

Clock time incorrectly set.

Perform adjustment to room temperature sensor and correct Room temperature offset.

Increase “Room influence”.

Select a better location for FW 100.

Check time setting.

The building retains a lot of heat.

BUS connection or BUS subscriber faulty.

Mode selector faulty.

Domestic hot water temperature control on boiler set too low.

Flow temperature controller on the boiler set too low.

Domestic hot water programme fault.

Incorrect System configuration for domestic hot water system.

“Heating levels” for “Comfort” - Correct heating curve.

Set the flow temperature controller higher.

Reduce influence of solar optimisation if necessary.

Bleed radiators and vent the heating system.

Perform adjustment to room temperature sensor and correct Room temperature offset.

Deactivate the boilers holiday function.

Set “Heating up speed” e. g. to “Fast”.

Set an earlier switching time for “Economy” and/ or “Frost”.

Check the BUS connection against the wiring diagram and correct it if required.

Have FW 100 replaced by your installer.

Set domestic hot water temperature control higher.

Reduce influence of solar optimisation if necessary.

Turn the flow temperature control on the boiler clockwise as far as it will go.

Check/correct programme.

Correct the configuration to match the domestic hot water system connected.

Tab. 31

62 8 716 115 748 (2009/09)