Bosch PROTANKLESS GWH 345 User Manual page 33

Fault Indication
Only tank loading (no heating function).
Only heating (no tank load function).
Low temperature (domestic hot water).
Insufficient water flow.
Table 16
1) Check connections, fuse or if there are visible damages.
Error lock-out is indicated by the orange LCD blinking. An error lock-out is done for safety reasons. After fixing the
problem, press the reset button to return the heater to service.
6 720 607 909
Possible Cause
No heat demand by the thermostat,
thermostat not well adjusted, other
defect.
No heat demand by the NTC, defect.
To low burner power, burner ON / OFF.
• Low water pressure
• Filter, taps or heat exchanger with
.
dirt
Troubleshooting
Check
• 1. Check thermostat position
1)
• 2. Check electronic unit
• 1. Check NTC cable
• 2. Check water (filter, ...)
• 3. Check Domestic hot water - NTC
(Tank)
1)
• 4. Check electronic unit
• 1. Check air vent
• 2. Check Adjustment of gas, gas
valve
• 3. Check Domestic hot water-NTC
1)
• 4. Check electronic unit
• 1. Check inlet pressure
• 2. Check filter, taps, heat exchanger
.
and clean
.
.
.
33