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12. Troubleshooting
Problem
Possible cause
Remedy
Permanent acoustic signal • Heavy operation of the • Remove valve opera-
and display of “F1” on the
valve or blocked valve.
ting mechanism.
valve operating mechanism’s
• Manually check
display.
valve operation.
•Re-install valve ope-
rating mechanism.
•If necessary ask a
heating expert for
advice.
Permanent acoustic signal • Control range too wide. • Re-install valve
and display of “F2” on the
• Valve operating mecha-
operating mechanism.
valve operating mechanism’s nism not mounted on
• Unsuitable valve.
display.
heating valve.
• Put a 1mm spacer
(e.g. a shim) between
heating valve and
actuator.
Permanent acoustic signal • Control range too narrow. • Re-install valve
and display of “F3” on the
operating mecha-
valve operating mechanism’s
nism.
display.
• Unsuitable valve.
No antenna symbol displayed • Radio connection failure • Install heating control
on the valve operating
due to interference.
in a different loca-
mechanism’s display. At an • Heating control battery tion.
interval of one hour the valve empty.
• Replace heating
operating mechanism gene- • Wrong heating control
control batteries.
rates a sequence of tones.
code.
• Transmit the current
The valve opening is 30%.
safety code to the
valve operating
mechanism.
“Low Bat” symbol displayed • Valve operating mecha- • Replace the batteries.
on the display, for one hour nism batteries almost
and at an interval of 2 min. empty.
the valve operating mechanism
generates a sequence of tones.
Display of “LOC” when key is • Key lock is active.
• Deactivate the key
pressed.
lock.
