18.0 Fault Finding
Domestic Hot Water - Follow operational sequence
Turn selector switch to The display illuminates
NO
Go to section ‘A’
YES
Error 110 flashing | YES |
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Error 133 flashing |
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NO |
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Error 20, 28 or 50 flashing |
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NO |
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Error 119 flashing |
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NO |
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Turn Domestic Hot Water |
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thermostat to Maximum. |
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Open DHW tap fully. |
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DHW Hall Effect sensor | NO |
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operated (red neon on the |
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sensor illuminated |
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YES |
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| NO |
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Domestic Hot Water circuit |
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YES |
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Pump runs |
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YES |
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Fan runs |
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YES |
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Fan runs at correct speed |
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YES |
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Spark at ignition electrodes for | NO |
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up to 5 seconds and for 3 |
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attempts |
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YES | NO | ||||
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Burner lights |
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YES |
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| NO |
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Burner output modulates to |
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maintain the temperature set |
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YES |
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Close DHW tap |
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YES |
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DHW flow sensor senses no | YES |
flow. Burner goes out |
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| Turn the selector switch to | YES | |
| reset position for 5 seconds |
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| Go to section ‘E’ |
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| Go to section ‘C’ |
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| YES | |
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| DHW flow rate more than 2 | ||
| l/min |
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| Go to section ‘K’ |
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| Error 125 flashing |
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| Go to section ‘B’ |
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| Error 160 flashing |
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| Go to section ‘D’ |
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| Error 160 flashing |
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| Go to section ‘L’ |
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| YES | |
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| Error 133 flashing | ||
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| Go to section ‘F’ |
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| YES |
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| Burner does not stay alights | ||
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| Reduce DHW flow rate | ||
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| Burner modulates |
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| Error 130 flashing |
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| Go to section ‘M’ |
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| Fan stops after 10 seconds |
If the error 110 is still flashing.
Go to section ‘J’
Go to section ‘B’
YES
Is mains water filter and
assembly clean?
Is the magnetic detector free
to move in the Hall Effect
sensor
Go to section ‘H’
Turn the selector switch to the
reset position for 5 seconds
Error 133 flashing
Go to section ‘I’
Clean DHW NTC sensor and DHW heat exchanger
YES
Pump runs for 30 seconds
Operation sequence
successful
54© Baxi Heating UK Ltd 2008