Bedienungsanleitung Bosch FR120 (Seite 57 von 68) (Englisch)

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Troubleshooting | 57

9.2 Troubleshooting without using display

If the fault persists:

B Call an authorised contractor or the customer

service department and inform them of the

fault, quoting the appliance details (from type

plate inside flap).

Appliance details

Type:

..........................................................................

Part number:

..........................................................................

Date of manufacture (FD...):

..........................................................................

Problem Cause Remedy

Required room temperature

not achieved.

Thermostatic valve(s) set too low. Set thermostatic valve(s) higher.

Flow temperature controller on heating

appliance set too low.

Set the flow temperature controller

higher.

Reduce influence of solar optimisation if

necessary.

Air in the heating system. Bleed radiators and vent the heating

system.

Required room temperature

greatly exceeded.

Radiators become too hot. Set thermostatic valve(s) lower.

Set “Heating levels” for “Comfort” lower.

Installation location of FR 120

unfavourable, e.g. external wall, close to

window, in a draught etc.

Select a better installation location for

FR 120 and ask your contractor to

reposition it.

Excessive room temperature

fluctuations.

Temporary influence of external heat on

the room, e.g. through solar radiation,

lighting, TV, fireplace etc.

Select a better installation location for

FR 120 and ask your contractor to

reposition it.

Temperature rises instead of

falling.

Time incorrectly set. Check time setting.

Room temperature too high

during “Economy” and/or

“Frost” mode.

The building retains a lot of heat. Set an earlier switching time for

“Economy” and/or “Frost”.

Incorrect or nocontrol. BUS connection of BUS subscribers

faulty.

Ask your heating contractor to check the

BUS connection against the connection

diagram and correct if required.

Controller can only be set to

automatic mode.

Operating mode selector faulty. Have FR 120 replaced by your contractor.

DHW cylinder does not heat

up.

DHW temperature control on heating

appliance set too low.

Set DHW temperature controller higher.

Reduce influence of solar optimisation if

necessary.

Flow temperature controller on heating

appliance set too low.

Turn flow temperature controller on heating

appliance clockwise as far as it will go.

DHW program incorrect Check/correct program.

Incorrect System configuration for DHW

system.

Correct the configuration to match the

DHW system connected.

Heating on during the night. Heat-up optimisation starts the heating

early so that the home reaches the required

room temperature by the set time.

Set a later time for the required room

temperature.

Switch off heat-up optimisation.

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Bosch FR120 Seite 57

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