Service
Control 8313 – 6720859567 (2017/03)
46
DHW
Temperature
Sensor
defective
Heating of DHW is stopped. • The temperature sensor is incorrectly
connected or faulty.
• DHW was selected.
• The module or the control unit is faulty.
▶ Check sensor port.
▶ Check the sensor mounting on
the DHW cylinder.
▶ If DHW heating is not required,
switch off DHW.
▶ Replace temperature sensor
if necessary.
▶ Replace module or control unit
if required.
DHW remains
cold
Heating of DHW is stopped. Current
DHW temperature is below 40 °C.
• The cylinder primary pump is faulty.
• The FM-MW module is defective.
• More DHW is removed than newly heated.
▶ Check whether the function is set to
Auto.
▶ Check the function of the temperature
sensor and the primary pump.
▶ Replace module or control unit if
required.
Thermal
disinfection
failed
Thermal disinfection has been
interrupted.
• The output of the heat source is insufficient,
e.g. because other heat consumers (e.g.
heating circuits) demand heat during
thermal disinfection.
• The temperature sensor is incorrectly
connected or faulty.
• The cylinder primary pump is incorrectly
connected or faulty.
• The FM-MW module or the control unit is
faulty.
• The draw-off rate during thermal
disinfection is too high.
▶ Select the time for thermal disinfection
so that there is no overlap with additional
heat requirements.
▶ Check the function of the temperature
sensor and the primary pump.
▶ Replace the temperature sensor and
primary pump if required.
▶ Replace module or control unit if
required.
Defective
Remote
Control heating
circuit sensor
Because no actual value for room
temperature is currently available, the
room influence, switch-on and switch-
off optimisation, and automatic
adaptation features drop out.
The control unit operates with the last
values set at the remote control.
• The remote control is incorrectly connected
or defective.
• The temperature sensor is incorrectly
connected or faulty.
• The remote control has been incorrectly
allocated.
• The cable for the remote control is
disconnected.
• The remote control is faulty.
• The control unit or the module is faulty.
▶ Check function and connection of the
remote control.
▶ Also check the addressing of the remote
control.
▶ Replace the remote control and function
module.
▶ Check connecting cable.
Communicatio
n HK 1...x,
Communicatio
n Fault to
Remote
Control
Because no actual value for room
temperature is currently available, the
room influence, switch-on and switch-
off optimisation, and automatic
adaptation features drop out.
• The remote control is incorrectly connected
or defective.
• The remote control has been incorrectly
allocated an address.
• The cable for the remote control is
disconnected.
• No remote control was allocated to the
heating circuit.
• The control unit is faulty.
▶ Check function and connection of the
remote control.
▶ Also check the addressing of the remote
control.
▶ Check the heating circuit settings.
▶ Replace the remote control and function
module.
Defective flow
temperature
sensor for heat
source
The heat source is shuts down. • The temperature sensor is incorrectly
connected or faulty.
• The temperature sensor, the SAFe or the
control unit is defective.
▶ Check sensor port.
▶ Replace boiler water temperature
sensor, SAFe or central module.
Heat Source
Return
Temperature
Sensor
defective
Return temperature control is no
longer possible.
The mixing valves are fully opened.
The heat source is enabled with
maximum output.
• The temperature sensor is incorrectly
connected or faulty.
• The ZM5313 central module or the control
unit is faulty.
▶ Check sensor port.
▶ Replace boiler water temperature sensor
or central module.
SI 1 Safety
Device
triggered
Boiler protection (against frost and
condensation) is not ensured.
• The safety equipment in the safety chain
has responded.
• The high limit safety cut-out has responded.
• The control unit is faulty.
▶ Check safety equipment.
▶ Find the cause of the high limit safety cut-
out trigger (e.g. check control unit
functions).
▶ Remedy the cause.
Fault,
observation
Effect on control characteristics Reason Remedy
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