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13.11.5 Check the appliance's operation. Water leakage is unacceptable.
13.12
Replacement of the pipe of hot water outlet from the heat exchanger
13.12.1 Remove the casing, see p. 13.1.
13.12.2 Disconnect the hot water outlet from the heater.
13.12.3 Disconnect the cables 23 and 24 from the thermo relay 22.
13.12.4 Unscrew the captive nut of the pipe 6 from the fitting of the pipe of the heat exchanger 2 and remove the pipe 6 together with the gaskets.
13.12.5 Remove the thermo relay 22, unscrewing the screws of the loop 8.
13.12.6 Install a new pipe with new gaskets, with previously installed thermo relay 22, fixed with screws to the loop 8.
13.12.7 Check the appliance's operation. Water leakage is unacceptable.
13.13
Replacement of thermo relay (draught sensor)
13.13.1 Remove the casing, see p. 13.1.
13.13.2 Disconnect the cables from the thermo relay 18.
13.13.3 Remove the carrier 38 with the thermo relay18 with the gas removal device, pushing up the lock on the carrier.
13.13.4 Unscrew two screws fixing the thermo relay 18 to the carrier 38 and remove the thermo relay.
13.13.5 Install a new thermo relay.
13.13.6 Check the appliance's working capacity with the new thermo relay, see p.12.6.
13.14
Replacement of the electronic control block
13.14.1 Remove the casing, see p. 13.1
13.14.2 Disconnect all external connection cables and connectors of the electronic control block 4.
13.14.3 Unscrew two screws fixing the electronic control block 4 to the carrier on the body frame's rear wall and remove it.
13.14.4 Install a new electronic control block.
13.14.5 Check the appliance's operation with the new electronic control block.
13.15
Replacement of the plug or flame sensor
13.15.1 Remove the casing, see p 13.1.
13.15.2 Remove the cables from the plug and from the flame sensor of the ignition burner 11.
13.15.3 Remove the flame sensor and (or) the plug from the ignition burner 11, unscrewing their fixation screws.
13.15.4 Install a new flame sensor and/or plug
13.15.5 Check the appliance's working capacity.
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