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fauLT repaIr
5.5
overview of alarms, boiler controller
error code Description
What should be done?
e:01
STB (safety temperature limiter)
1. Boiler STB has tripped
To unlock, open the front door; STB is located on the underside of the
control box. Remove cover and press the button in. Then acknowledge
the fault by pressing the reset button.
e:02/ e:03
Interruption/ short-circuit, flue gas sensor
Contact Hoval heating engineer
e:04/ e:05
Interruption/ short-circuit, combustion chamber sensor Contact Hoval heating engineer
e:06/ e:07
Interruption, boiler sensor
Contact Hoval heating engineer
e:12
Feed signal, stoker/feeder screw:
screw at a standstill
Contact Hoval heating engineer
e:16
Number of start attempts exceeded
(minimum combustion chamber temperature not
reached after fire-bed build-up)
Clean boiler (see Chapter "Maintenance“); if fault occurs repeatedly,
contact Hoval heating engineer
e:29
Vacuum not OK
Clean burner and boiler (see Chapter "Maintenance“); if fault occurs
repeatedly at short intervals, contact Hoval heating engineer
e:33
Ignition not successful
(no increase in combustion chamber temperature dur-
ing the ignition process)
Clean boiler (see Chapter "Maintenance“); if fault occurs repeatedly,
contact Hoval heating engineer
e:37
Filling time exceeded,
but pellet hopper is empty
1. Check whether there are pellets left in the storage room
2. Check whether the suction hoses are clogged with pellets at some
point
Otherwise: Contact Hoval heating engineer.
e:38
Filling process aborted due to:
1. Screw motor overheating (if fitted)
2. Suction turbine overheating
3. Storage room door contact switch (if fitted) opened
1./ 3.: Check suction hoses and screw transfer station for blockages and
remove if necessary.
2. Close the door to the storage room
e(45)
Only when using switchover unit with suction probes:
All available suction probes have been approached and
the maximum filling time has expired, but the pellet hop
-
per is not completely full
1. Check whether the conveyor hoses are blocked at some point
2. Check whether there are pellets available at the suction probes in the
storage room
3. Otherwise: Contact Hoval heating engineer
e:46
Only when using switchover unit with suction probes:
Switchover unit is blocked, the maximum time for the
switchover process has been exceeded 2x
Contact Hoval heating engineer
B:20
Maximum boiler temperature exceeded
B:21
1. Blocking switch active
or
2. Ash box not fitted or not fitted correctly
Set blocking switch to "1"
or
fit ash box correctly
B:32
Filling level sensors, wrong signal order
1. Check pellet hopper for bridging (lower sensor is "in the open“ al-
though the upper sensor is still covered with material) as a result of too
much dust in the fuel
2. Empty pellet hopper and clean it, remove dust from the sensors
3. Otherwise: Contact Hoval heating engineer
W:08/ W:09
Interruption/ short-circuit, return sensor
Contact Hoval heating engineer
W:10/ W:11
Interruption/short-circuit burner buffer sensor
(if fitted)
Contact Hoval heating engineer
W:17
Filling time exceeded
1. Check whether pellets are available in the storage room
2. Check if pellets are blocking the vacuum hoses at some point
Otherwise: Contact Hoval heating engineer.
W:18
Storage room empty
(only if filling level monitoring is fitted in the storage
room)
Order pellets
W:19
Lambda probe test failed
W:22
Filling blocked through off-period
W:23
Fire-bed extinguished during operation
W:24
Lambda probe test aborted as a result of flue gas
temperature
W:30
Low vacuum (10% increase active)
W:34
Value measured by the lambda probe does not recover
W:40
Empty ash box
Empty ash box and reset counter
W:41
Boiler cleaning necessary
Clean boiler and burner and reset counter
W:42
Only with manual filling without autom. filling system:
pellet hopper empty.
Top up with pellets
