Bosch Pro Tankless GWH-450-ES Series, Руководство пользователя

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Troubleshooting
6 Troubleshooting
Error codes and diagnostics
The following table is a diagnostic indicator and it does not solve all the technical problems that may occur with the
appliance. It is very important to retain a good working knowledge of the appliance , its electrical and hydraulic layout
and functional operation.
Fault Indication Possible Cause Check
Orange LED + 100°F flashing Shut down by the temperature limiter
(over temperature). • Check position of heating NTC
• Check temperature limiter, cables
• Check system with air, air vent
.
Orange LED + 110°F flashing No Flame detected (no ignition). • Check gas inlet pressure, gas type,
air inside gas pipe
• Check flame, ignition
• Check burner pressure, injectors
• Check ionisation sensor, cable
• Check electronic unit.
Orange LED + 125°F flashing "false flame" (error during self check of
electronic). • Check humidity at Electronic
• Check cables, sensor contacts
(corrosion)
• Check flame inside Burner chamber
• Check electronic unit.
Orange LED + 140°F flashing Shut down because of low voltage. • Check power supply
• Check electronic unit.
Orange LED + 100°F + 140°F flashing Shut down by pressure switch. • Check chimney, fresh air tube and
combustion gas tube
• Check ventilator, Venturi / silicone
tubes
• Check pressure switch (short,
opened)
• Check cables, electronic.
Orange LED + 110°F + 140°F flashing NTC defect (no function) • Check NTC
• Check cable (opened, short)
• Check electronic unit.
LED of the appliance doesn't start up,
no function. No mains voltage supply, fuse blown,
transformer etc. defect • Check mains voltage supply
• Check fuse
• Check electronic unit.
Noise; boiling noise (over heating), no
correct function. Low circulation, air inside installation,
bad heat transfer. • Check air in system, air vent
• Check circulation
• Check heat exchanger
• Check gas type, injectors, gas valve.
Low temperature (sanitary water). To low burner power, burner ON / OFF. • Check air vent
• Check Adjustment of gas, gas valve
• Check NTC
• Check electronic unit.
Insufficient water flow. • Low water pressure
• Filter, taps or heat exchanger with
dirt
.
• Check inlet pressure
• Check filter, taps, heat exchanger
and clean
.
Table 9