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b) Valve operating mechanism
Error Message
Possible cause
Solution
Permanent signal tone and
• The valve is too sluggish
• Remove the valve operating
‘F1’ on the display
or the valve operating mechanism
mechanism
is blocked
• Manually check valve operation
• Mount the valve operating
mechanism again
• If necessary consult a heating
specialist
Permanent signal tone and
• Control range is too large
• Unsuitable valve
‘F2’ on the display
• Valve operating mechanism
• Mount the valve operating
not mounted
mechanism again
• Insert a 1mm thick lug
(for example, a washer) between
the heating valve and
the actuator
Permanent signal tone and
• Control range is too small
• Unsuitable valve
‘F3’ on the display
• Mount the valve operating mecha-
nism again
No radio symbol on the display,
• Loss of radio transmission
• Install control unit at a different
the valve operating mechanism
due to interference
location
emits a tone sequence every hour.
• Control unit batteries
• Replace the batteries
The valve is approx. 30%
are empty
• Transmit the current code
open
• The control unit’s code was
to the valve operating
changed, without
mechanism
synchronising the
valve operating mechanism
Low battery symbol on the display,
• The valve operating mechanism’s
• Replace the batteries
the valve operating mechanism
batteries are empty
emits a tone sequence every
2 minutes for an hour
FHT 8W Heat Demand Relay
Installation and User Guide
Product Code EHC-FH06
1