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Bosch Pro Tankless GWH-450-ES Series Manual page 25

Temperature modulated with electronic ignition - normal duty suitable for recirculating potable water only
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Malfunction
Orange LED + 100°F - The appli-
ance shuts down shortly after the
ignition.
Orange LED + 110°F
Orange LED + 125°F
Orange LED + 140°F
Orange LED + 110°F + 140°F
Orange LED + 140°F
The appliance only ignite after several
attempts.
The appliance does not ignite.
Reduced flow on the domestic hot
water circuit
Table 10
1)
Service or replacement of the high temperature limit switch, contact authorized responsible.
Lock out of the appliance signalised by the blinking of the orange LED and LCD indication is done by safety reasons.
After solving the problem, it is necessary to press the reset button in order that the appliance starts working again.
6 720 607 915
Cause
Over
heating
detected
temperature limit stat.
Lack of ionisation signal.
Ionisation signal detected with the
burner stopped.
Gas valve is not being detected.
Primary NTC temperature sensor dis-
connected or in short circuit.
Supply voltage inferior to 90 V.a.c.
Air on the gas pipes.
Lack of electrical supply.
Low inlet water pressure
Dirt on the filter
Solution
by
the
• Check if there is any obstruction on
central heating circuit
• Purge the central heating installation
• Check if the pump is moving
• Check the temperature limit stat
• Check the gas supply
• Check the complete ignition system
• Check the sensor electrode
• Check the control unit
• Check the electrical connections to
the primary NTC sensor and the pri-
mary NTC sensor itself
• Check the electrical connections to
the primary NTC sensor and the
primary NTC sensor itself
• Check electrical supply installation
• Purge the gas supply pipes
• Check the electrical supply
• Check the supply water pressure
• Check the filters on the appliance
and on the taps
Troubleshooting
1)
.
.
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.
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25

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