12 Troubleshooting
24
Installation and maintenance instructions SUSTAIN ..s 0020200967_00
11.10 Checking the admission pressure of the
expansion vessel
1.
Drain the product. (
→
Page 23)
2.
Measure the pre-charge pressure of the expansion ves-
sel at the vessel valve.
Conditions
: Pre-charge pressure < 0.075 MPa (0.75 bar)
▶
Top up the expansion vessel in accordance with the
static height of the heating installation, ideally with ni-
trogen, otherwise with air. Ensure that the drain valve is
open when topping up.
3.
If water escapes from the expansion vessel's valve, you
must replace the expansion vessel (
→
Page 25).
4.
Fill and purge the heating installation. (
→
Page 18)
11.11 Completing inspection and maintenance
work
1.
Check the gas connection pressure (gas flow pressure).
(
→
Page 18)
2.
Check the CO
₂
content. (
→
Page 19)
12 Troubleshooting
12.1
Rectifying faults
▶
If fault codes (F.XX) appear, refer to the table in the ap-
pendix or use the check programme(s).
Overview of fault codes (
→
Page 33)
Check programmes
–
Overview (
→
Page 28)
If several fault codes are generated at the same time, these
are displayed alternately followed by the time at which the
respective fault occurred.
▶
Hold the
button down for more than 3 seconds.
▶
If you are unable to clear the fault code and it reappears
despite several fault clearance attempts, contact cus-
tomer service.
12.2
Calling up the fault memory
The last 10 fault codes are stored in the fault memory (to-
gether with the time at which the respective fault occurred
and, after 24 hours, with the number of days).
▶
Hold the
button down for more than 7 seconds.
Overview of fault codes (
→
Page 33)
▶
Press the
button to exit this menu.
12.3
Deleting the fault memory
1.
Delete the fault memory using the diagnostics code
d.94
.
2.
Set the diagnostics code. (
→
Page 15)
Overview of diagnostics codes (
→
Page 28)
12.4
Resetting parameters to factory settings
1.
Reset all parameters to the factory settings using the
diagnostics code
d.96
.
2.
Set the diagnostics code. (
→
Page 15)
Overview of diagnostics codes (
→
Page 28)
12.5
Preparing the repair work
1.
Switch off the product.
2.
Disconnect the product from the power mains.
3.
Remove the front casing.
4.
Close the gas isolator cock.
5.
Close the service valves in the heating flow and in the
heating return.
6.
Close the service valve in the cold water pipe.
7.
Drain the product if you want to replace water-bearing
components of the product.
8.
Ensure that water does not drip on live components
(e.g. the electronics box).
9.
Use only new seals.
12.6
Replacing defective components
12.6.1 Replacing the burner
1.
Remove the gas-air mixture unit. (
→
Page 22)
2.
Remove the burner seal.
3.
Remove the burner.
4.
Install the new burner complete with new seal on the
heat exchanger.
5.
Install the gas-air mixture unit. (
→
Page 23)
12.6.2 Replacing the gas-air mixture unit
1.
Remove the gas-air mixture unit. (
→
Page 22)
2.
Install the new gas-air mixture unit (
→
Page 23).
12.6.3 Replacing the heat exchanger
1.
Remove the front casing. (
→
Page 10)
2.
Remove the gas-air mixture unit. (
→
Page 22)
1
A
B
3.
Remove the gas pipe
(1)
.
Summary of Contents for ENERGY 12s-A
Page 47: ......
