Maintenance Intervals; Malfunctions And Troubleshooting - Kerbl C 10 Mode D'emploi

3. The remaining water can be drained off via the drain valve (item 10).
4. Disconnect the heating element in the control unit and lead it through the cable gland. Note the wiring diagram!
5. Unscrew the heating element from the stainless steel flow tube. Make sure that the tool used is only applied to the stainless steel spanner
width SW 70. The heating element is glued in place with a low-strength thread seal.
6. If necessary, remove coarse dirt from the heating coil and flow tube with a brush.
Important!
7. Place the heating element in a bucket of descaling agent. The filling height of the bucket should be chosen so that only the heating coil
is covered with the descaling agent. Depending on the degree of calcification, adjust the exposure time to the descaling agent (follow the
manufacturer's instructions).
8. Rinse the flow tube and heating coil with clear water.
9. Remove any adhesive residue from the threads on the flow tube and the heating element.
10. Seal the heating element again in reverse order. Observe the drying time.
11. The following liquid thread sealant is recommended: Loxeal 18-10
12. Feed the cable of the heating element through the cable gland and connect it to the control unit. Note the wiring diagram!
13. Close the shut-off valve on the bypass pipe.
14. Open the shut-off valve (item 7) before and after the C10 circulation pump.
15. Carry out the bleed procedure according to Section 6.8.
16. Reconnect the unit to the mains voltage and put it into operation.

8.2 Maintenance intervals

Unit in operation
Check the function of the unit during operation.
Is the water circulating and is the heating element heating?
Inspect the entire unit.
Bleed the unit and ring pipe according to Section 6.8.
Check the unit for limescale and, if necessary, descale and
clean it according to Section 8.1.
Clean the outside of the unit.
Check electrical components and connection cables for da-
mage.
Unit out of operation
Check the free running of the circulation pump. To do this, set
the selector switch to position 1 and check circulation in the
ring pipe.
Clean the outside of the unit.

9. Malfunctions and troubleshooting

Fault Cause
No power supply
Fuse defective
Unit does not start
Residual current circuit breaker has
tripped
No power supply
Pump won't start
For further error messages, see the operating instructions for the circulating pump
Air in the unit
Air in the pump
Loud noises
Cavitation due to insufficient supply
pressure
Daily Weekly
x
x
x
x
Daily Weekly
x
Corrective measure
• Check power supply
• Check fuse
• Check cause and rectify error
• Switch on the residual current circuit breaker again
• Check power supply
• Bleed the unit
Bleed the pump
• Increase system pressure within the permissible range
44
Half-yearly / before
Monthly
each heating period
x
x
x
Half-yearly / before
Monthly
each heating period
x
x
x
x
x