Technical data

7 181 465 346 GB (03.02)

Failure identification procedure

Loose or broken contact on heat store NTC sensor

Check Action

1. Heat store NTC sensor lead is not

fitted as described in the installation

instructions (i.e. the cable does not

pass through the cable grip in the

switchbox).

B Record condition of appliance as found in cus-

tomer service record.

B Route cable as specified in installation instruc-

tions.

Boiler indicates P1, P2, P3 at start-up and then restarts with P1..

Check Action

1. Fuse T 1,6 A (312) defective. yes: B Turn ON the appliance.

B Change the fuse.

B Power OFF the appliance.

Start sequence not completed? ↓2.

no: ↓2.

2. The PCB control board is damaged. B Make a note of the altered service settings (see

table 1, "First Service Level; Values that can be

modified" at page 8 and table 5, "Secondary

Service Level; Values that can be modified" at

page 11).

B Power OFF the appliance.

B Disconnect the boiler electrical connection.

B Change PCB control board.

B Reconnect the boiler electrical connection.

B Turn ON the appliance.

B Restore service settings previously noted down.