Vaillant aroSTOR VWL B 270/5 Instrucciones De Instalación Y Mantenimiento página 76

4. Remove the black decorative panel by pulling it force-
fully to the side.
5. Undo the screws (2) on the lower covering hood (3).
6. Remove the lower covering hood (3).
7. Undo the screws (4) and pull the cables out of the im-
mersion heater.
8. Remove the limit thermostat (5) from the immersion
heater (6).
9. Unscrew the set-up unit along with the immersion
heater (6) and its seal.
10. Check the scale deposition on the immersion heater.
11. Replace the seal.
9 Troubleshooting
9.1 Eliminating faults
▶
Before eliminating the fault, check that the product is
supplied with power.
▶
Check whether the stopcocks are open.
▶
If fault messages appear, eliminate the fault after check-
ing the table in the appendix.
Fault messages – Overview (→ Page 79)
▶
After eliminating the fault, start up the product once
again.
▶
If you are unable to eliminate the fault, contact Customer
Service.
9.2 Resetting parameters to factory settings
1. Turn the rotary knob until the RESE T PAR. menu is
displayed. – INST.MENU RESE T PAR..
2. Press the rotary knob.
3. Turn the rotary knob to select YES.
4. Press the rotary knob to confirm the selection.
5. Press the menu button to return to the original display.
9.3 Resetting the safety cut-out
2
1
1. Before resetting the safety cut-out (1), check whether
operation has been switched off by a low-tariff contact
or time programming.
2. Check whether the safety cut-out for the auxiliary elec-
tric heating has been tripped as a result of overheating
(> 87 °C), or as a result of a defect.
3. Remove the covering hood. (→ Page 66)
4. Ensure that the immersion heater is not calcified.
5. Press the button (2) to reset the safety cut-out.
76
Note
The safety cut-out settings must not be
changed.
9.4 Replacing the power supply cable
2
3
4
5
1
6
1. If the product's power supply cable is damaged, it must
be replaced.
Note
The electrical installation must only be car-
ried out by a competent person.
2. Remove the covering hood. (→ Page 66)
3. Remove the cover from the PCB.
4. Carry out the wiring. (→ Page 70)
5. Guide the power supply cable through the grommet on
the rear of the electronics box.
6. Connect the power supply cable to the power supply
connection for the product.
9.5 Completing repair work
1. Install the covering hood. (→ Page 66)
2. Establish the power supply.
3. Open all of the stopcocks.
4. Switch on the product. (→ Page 72)
5. Check that the product and the hydraulic connections
work correctly and check for tightness.
10 Inspection and maintenance
10.1 Preparing the maintenance and repair work
1. Decommission the product.
2. Disconnect the product from the power grid.
3. Wait until the fan has come to a complete stop.
4. Close the stopcocks in the hydraulic circuit.
5. Close the stopcock upstream of the safety assembly on
the cold water inlet.
6. Remove the covering hood. (→ Page 66)
7. Drain the product if you want to replace water-carrying
components of the product.
8. Ensure that water does not drip on live components
(e.g. the electronics box).
9. Use only new seals.
Installation and maintenance instructions 8000015884_00