Vaillant ecoTEC plus 937 Service Manual download pdf (Page 71)

Installation and maintenance instructions ecoTEC plus 937 0020031552_06 71

Replacing components 10

Fit the pipe elbow onto the new Aqua-Sensor and use

new gaskets.

Mount the new Aqua-Sensor in reverse order and

replace the seals.

Connect the line plug of the Aqua-Sensors with the

wiring harness.

Re-fit the discharge pipe (1) and use new gaskets.

Filling and vent the combi boiler and the shift load

storage tank.

After completion of the work check the system for

water leaks and carry out a function test (see Sec-

tion 8.8).

10.9 Replacing the electronics on the shift load

storage tank

Danger!

Risk of personal injury and/or material

damage as a result of non-compliance with

the safety instructions.

Before replacing the component, comply

with the safety instructions in Chapter 10.1.

Isolate the unit from the mains as described in Sec-

tion 10.1.

Close the gas isolator valve in the gas supply pipe.

Comply with the assembly and installation manuals

provided with the spare parts.

Remove the screw on the top cover of the shift load

storage tank and remove the cover.

Fig. 10.10 Replacing electronics

Pull the electronics (1) out of the location slot.

Pull off the plug connector from the wiring harness.

Fit the new electronics in reverse order.

Start up the appliance.

Check the correct setting of the unit variants (DSN) as

follows:

Enter the 2nd diagnostic level of the combi boiler.

Set the equipment-specific DSN value (parameter

"d.93“) in accordance with Table 10.1.

Appliance type DSN

ecoTEC plus 937 8

Table 10.1 DSN Setting Values

Exit the diagnostic mode.

The combi boiler ecoTEC plus 937 is ready for opera-

tion.

10.10 Replacing the electronics and display on the

combi-heater

Danger!

Risk of personal injury and/or material

damage as a result of non-compliance with

the safety instructions.

Before replacing the component, comply

with the safety instructions in Chapter 10.1.

Comply with the assembly and installation manuals

provided with the spare parts.

Replacing the display or the electronics

If you are only replacing one of the two components the

parameter settings take place automatically. When

switching the unit on the new component automatically

takes the pre-set parameters from the components

which have not been changed.

Replacing the display or the electronics

When replacing both components, after being turned on,

the appliance goes to fault and displays the error mes-

sage F.70.

In the second diagnostic level, under the diagnostic

point "d.93" enter the number of appliance variant

according to Table 9.1 (see Chapter 9.9).

The electronics is now set to the appliance type and the

parameters of all adjustable diagnostic points corre-

spond to the factory settings.

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 79 80

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Vaillant ecoTEC plus 937 Service Manual Page 71

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