Checking The Immersion Heater; Troubleshooting; Eliminating Faults; Resetting Parameters To Factory Settings - Vaillant aroSTOR VWL BM 270/5 Installation And Maintenance Instructions Manual

8.11.4 Preparing a blower door test
1
1. If you want to carry out a blower door test, you must
seal the product's condensate overflow.
2. Use the supplied plug (1) to seal the condensate over-
flow.
Caution.
Risk of material damage when closing the
condensate overflow
The condensate cannot flow out via the over-
flow if the waste-water pipework is blocked.
▶
After the blower-door test and before
starting up the product, ensure that the
plug for sealing the overflow has been re-
moved.
3. You will need to remove the plug from the condensate
overflow before starting up the product again.
8.12

Checking the immersion heater

3
2
4
1
1. Press the on/off button.
2. Disconnect the product from the power grid.
3. Drain the product. (→ Page 22)
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.
0020290840_00 aroSTOR Installation and maintenance instructions
6
5
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
▶
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 11)
4. Ensure that the immersion heater is not calcified.
5. Press the button (2) to reset the safety cut-out.
Note
The safety cut-out settings must not be
changed.
Troubleshooting 9
21