Bosch Appliances GWH-345/450-ESR-N manual Troubleshooting, Fault Indication, Possible Cause, Check

			Troubleshooting
Fault Indication	Possible Cause		Check
Only tank loading (no heating function).	No heat demand by the thermostat,		• 1. Check thermostat position
	thermostat not well adjusted, other		• 2. Check electronic unit1).
	defect.
Only heating (no tank load function).	No heat demand by the NTC, defect.		• 1. Check NTC cable
			• 2. Check water (filter, …)
			• 3. Check Domestic hot water - NTC
			(Tank)
			• 4. Check electronic unit1).
Low temperature (domestic hot water).	To low burner power, burner ON / OFF.		• 1. Check air vent
			• 2. Check Adjustment of gas, gas
			valve
			• 3. Check Domestic hot water-NTC
			• 4. Check electronic unit1).
Insufficient water flow.	•	Low water pressure	• 1. Check inlet pressure
	•	Filter, taps or heat exchanger with	• 2. Check filter, taps, heat exchanger
		dirt.	and clean.

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.

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