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Strebel Ltd.
Installation and user manual EN_FMT
CHAPTER 11. MALFUNCTIONS
11.1. No signal on the display…………………………………………………………………………………………………….……… 24
11.2. Fault code 'U/d or U/O' (alternating U with a status code will appear on the display)………………………….……………. 24
11.3. Unit does not respond to central heating heat demand………………………………………………………………………… 24
11.4. Unit does not respond to HWS demand……………………………………………………………………………….…………. 24
11.5. Measuring the fan impedence…………………………………………………………………………………………..…………. 24
11.6. Check function of gas block……………………………………………………………………………………………………..… 24
11.7. Malfunction code 'F' (flashing)…………………………………………………………………………………………..………… 24
11.7.1. Gas block will not open (no voltage)…………………………………………………………………………….…………. 24
11.7.2. Gas block will not open (gas inlet pressure too high)……………………………………………………………..……… 25
11.7.3. Gas block will not open (coils defective)…………………………………………………………………………..……….. 25
11.7.4. Gas/air mixture is not correctly adjusted…………………………………………………………………………….…….. 25
11.7.5. Check glow plug………………………………………………………………………………………………………….…… 25
11.7.6. Replace glow plug……………………………………………………………………………………………………………. 25
11.7.7. Measure ionisation current……………………………………………………………………………………….…….……. 25
11.7.8. ionisation probe or ionisation cable makes short circuit with earth……………………………………………..………. 25
11.7.9. Inspection and/or cleaning or replacement of the ionisation probe……………………………….…………………….. 26
USER MANUAL
General
Cleaning the unit
Holidays
Brrrr, the central heating is not working
Electricity and gas
Water and air
Other causes
Display
Reset button
Abbreviated display indications
4