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13. Troubleshooting
The control centre and the valve operating mechanism issue error messages (acoustic and display) to signal abnormal
behaviour during the operating mode. The following table explains the error messages and provides possible solutions to
the problems.
Ö
Take note of all the instructions in this user manual.
a) Control centre
Error message
Possible cause
Solution
Low battery symbol on the display
• 9V block battery is empty
• Replace the battery,
see section 11. a)
When removing the FHZ1000
• Empty battery
• Replace the battery,
from the wall holder
see section 11. a)
the LCD goes out
Key symbol
• Button lock is activated
• Release button lock,
on the display,
see section 6. a), item 5
no operation is possible
Control centre emits a signal tone,
• An alarm has been set off
• Verify the alarm
exclamation mark on
and eliminate the alarm trigger.
the display
See section 6. f)
An alarm
• Open window
• Increase permitted deviation from
for low temperature
• Valve operating mechanism
target value
has been set off
faulty/jammed
• Remove the cause of the error
• Valve is jammed
• Flow is too low etc.
A room control cannot
• This room control was
• Clear the room control for
be installed (no
already registered with another
registration, see user manual
entry in the list
control centre
for the FHT8b room control,
of the FHZ1000)
section ‘CEnt’.
‘Check mark’ on the
• A confirmed
• Resolve the alarm trigger, see
lower display line
alarm is present
section 6. f)
FHT 8W Heat Demand Relay
Installation and User Guide
Product Code EHC-FH06
1