Cause of error Error correction
Check/clean outfeed
system (for manual
universal suction systems)
For information on errors in
the screw suction system
see the previous page!
021 S For manual universal
suction systems:
The MAX sensor is not
reached after 15 minutes of
suction at the probe:
• No pellets at the suction
probe
• Hose, probe or hose
connections blocked
•
• Sensor incorrectly set
Refill pellets in store
Remove blockage, shake the
hose, if necessary remove
foreign bodies, check pellet
length.
Install interchange unit on the
other probe
Readjust the sensor
Return temp low too long
015 W • Return feed temperature
too cold
Check return feed lift, check
sensor
Note: Bypass pump with the speed
control; always operate at
maximum power level!
Inform heating engineers or
Fröling customer services
Key switch engaged 028 S For direct screw discharge:
• key switch was turned off
For suction discharge:
• Handle of X9 connection
of the pellet module not
positioned
Turn the key switch on again.
Set handle at connection X9
See 7.3.2 Pellet module with
suction system
Safety temp. limiter
released
000 S Boiler has overheated,
substantial reduction in heat
consumption:
• Heating and pump
switches have gone off.
• Pump suddenly stops
• Slide valves/cut-offs
closed.
Set switch back to “AUTO”
Check pump
Reopen slide valves/cut-offs
Note: After cooling down, the
safety temperature limiter must be
released
See 6.2 Excessive
temperature
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