Troubleshooting
Continuation
6
Drain Valve
Timeout State10
3)
Functional test drain valve failed during sys-
tem startup
• Upper float switch of the boiler defective
• Lower float switch of the boiler defective
• Steam valve defective / does not open
• Drain defective / does not open
7
Thermostat
4)
Thermostat in the boiler has been tripped.
• Upper float switch of the boiler defective
• Lower float switch of the boiler defective
• Power controller for heater defective (Triac)
8
Drain Pump
Timeout
4)
Drain tank could not be emptied within 2
minutes.
• Maximum allowable length and height of
routing the drain hose exceeded.
• The drain hose clogged
• Drain pump defective
• Lower float switch of the drain
tank defective
9
Drain Short Cycle
4)
Average cycles between the drains of the
drain tank too short.
• Maximum allowable length and height of
routing the drain hose exceeded.
• The drain hose clogged
• Drain pump defective
10 Drain Level Void
4)
Upper level float in the drain tank shows ok
although the lower float indicating low level.
→ Illegal switching combination of the
float switch in the drain tank
• Upper float switch of the drain tank
defective
• Lower float switch of drain tank
defective
11
Thermal Loss
Cycle Fault
4)
In the operating state "Standby" the time-out
"standby cycle" has been reached.
• Leakage / loss of steam
• Defective heater
• Power controller for heater defective (Triac)
12
Cylinder Level
Low
1)
Security level in the cylinder falls below the
short term.
― ― ―
13
Cylinder Level
Low
4)
In the operating mode "Normal operation"
the security level in the boiler has been ex-
ceeded for more than 10 minutes
→ Check the water supply
• Inlet valve defective / no water
• Upper float switch of the boiler defective
• Leakage / water loss / drain valve does not
close
14
Diagnostic
Steam Valve 4)
Cable break, short circuit or overheating of
the coil at the steam valve
• Steam valve defective
15
Diagnostic
Inlet Valve
3)
Cable break, short circuit or overheating of
the coil at the inlet valve
• Inlet valve defective
16
Diagnostic
Drain Valve
3)
Cable break, short circuit or overheating of
the coil at the drain valve
• Drain valve defective
17
Diagnostic
Drain Pump
4)
Cable break, short circuit or overheating of
the coil at the drain pump
• Drain pump defective
18 Supply 24V Local
4)
24V= Voltage is outside the permissible
value
― ― ―
19 Supply 5V Local
4)
5V= Voltage is outside the permissible
value
― ― ―
1)
Warning without change in safety position
2)
Warning with change in safety position
3)
Error without change in safety position
4)
Error with change in safety position
CAUTION!
The boiler heating may in case of error operate even without water in the steam boiler.
There is danger of overheating. Therefore when executing longer checks,
let the unit cool down in between.
Service Manual KBF (E5.2) 04-2015
33