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10.2 Dismantling and fitting probes
Loosen the nut at the probe end and remove the cable lugs
Unscrew the probe with wrench (27mm) and screw out carefully
Carefully remove probe taking care that the insulation (PTFE or ceramic) is not damaged.
Clean the probe electrode when it has completely cooled down with a clean, soft cloth.
If necessary, replace probe.
Clean and check sealing surfaces
Insert new sealing ring
Lubricate thread with heat-resistant solid lubricant (e.g. graphite).
Screw in electrode and tighten, max. tightening torque Md=140 Nm.
Fit into the add-on housing before establishing the electrical connection.
Refit protective housing
Start up the device again (see Chap. 8.4.)
The PTFE or ceramic insulation must not be damaged.
When starting up the boiler check the probe screw connection in the flange for
tightness and if necessary retighten! Observe Chap. 10.1!!
Do not seal thread with PTFE strip or the like (electrical insulating sealing compound)!
11. Fault analysis and rectification
The device terminal strip is live during operation!!
Before working on the device disconnect it from the mains!!
Various error states are displayed during operation via the LCD display of the CU (error code and plain
text abbreviation) and via the 2x7 segment display (error code) of an (optional) DU.
This information can be assigned to possible causes of error with the following table.
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