11 Troubleshooting
24 Installation and maintenance instructions SUSTAIN ..c 0020200954_00
10.5 Checking the burner
▶ Check the surface of the burner for damage. If you see
any damage, replace the burner.
10.6 Installing the gas-air mixture unit
1. Install the burner.
2. Install two new burner seals in the burner cover.
3. Install the gas-air mixture unit.
4. Install the flue pipe.
5. Install the air intake pipe.
10.7 Cleaning the condensate siphon
1. Unclip the lower section of the siphon (1) from the up-
per section of the siphon (2).
2. Remove the float (3).
3. Flush out the float and lower section of the siphon with
water.
4. Fill the lower section of the siphon with water up to 10
mm below the upper edge of the condensate drain pipe-
work.
5. Reinsert the float (3).
Note
Check whether the float is present in the
condensate siphon.
6. Clip the lower section of the siphon (1) into the upper
section of the siphon (2).
10.8 Cleaning the filter in the cold water inlet
1. Close the main cold water supply line.
2. Drain the product on the hot water side.
3. Remove the connection piece from the connection for
the product's cold water supply.
4. Clean the filter in the cold water inlet without removing
it.
10.9 Draining the product
1. Close the service valves of the product.
2. Start check programme P.05 (→ Page 17).
Check programmes – Overview (→ Page 28)
3. Open the drain valves.
4. Make sure that the air vent cap on the internal pump is
open so that the product can be drained fully.
10.10 Checking the admission pressure of the
expansion vessel
1. Drain the product. (→ Page 24)
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 valve of the expansion ves-
sel, you must replace the expansion vessel.
4. Fill the heating installation. (→ Page 19)
5. Purge the heating installation. (→ Page 19)
10.11 Completing inspection and maintenance
work
1. Check the gas connection pressure (gas flow pressure).
(→ Page 20)
2. Check the CO₂ content. (→ Page 20)
11 Troubleshooting
11.1 Rectifying faults
▶ If fault codes (F.XX) are present, refer to the table in the
appendix for advice or use the check programme(s).
Overview of fault codes (→ Page 33)
Check programmes – Overview (→ Page 28)
If several faults are present at the same time, the fault codes
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.
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