Troubleshooting - Bosch PROTANKLESS GWH 345 User Manual

Troubleshooting

6 Troubleshooting
Fault Indication
E9
EA
F7
E0
F0
C4
C6
E2
A7
AA
LED or LCD of the appliance doesn't
start up, no function.
Noise; boiling noise (over heating), no
correct function.
Table 16
32
Possible Cause
Shut down by the temperature limiter
(over temperature).
No Flame detected (no ignition).
"false flame" (error during self check of
electronic).
Shut down because of low voltage.
Internal error in the electronic unit.
Fan not working
Shut down by pressure switch.
Heating - NTC defect (no function)
Domestic hot water - Tank NTC defect
(no function)
Flow reduced
No voltage supply, fuse
transformer etc. defect
Low circulation, air inside installation,
bad heat transfer.
Check
• 1. Check position of heating NTC
• 2. Check temperature limiter, cables
• 3. Check system with air, air vent
• 4. Bleed air from system.
• 1. Check gas inlet pressure, gas
type, air inside gas pipe
• 2. Check flame, ignition
• 3. Check burner pressure, injectors
• 4. Check ionisation sensor, cable
• 5. Check electronic unit
• 1. Check for moisture on the
Electronics
• 2. Check cables, sensor contacts
(corrosion)
• 3. Check flame inside Burner
chamber
• 4. Check electronic unit
• 1. Check power supply
• 2. Check electronic unit
• 1. Check electronic unit connections
and wiring.
•
2. Replace electronic unit
• 1. No power to fan, check for 115
volts at fan
• 2. Check wire connections
• 1. Blocked vent
• 2. Fresh air supply inadequate
• 3. Silicone tubes from pressure
switch not connected - clear or clear
and black
• 4. Check wire and connection.
• 1. Check heating - NTC
• 2. Check cable (opened, short)
• 3. Check electronic unit
• 1. Check domestic hot water - NTC
• 2. Check cable (opened, short)
• 3. Check electronic unit
• 1. Check heat exchanger - flush or
descale if necessary
blown, • 1. Check voltage supply
• 2. Check fuse
• 3. Check electronic unit
• 1. Check air in system, air vent
• 2. Check heating circulation
• 3. Check heat exchanger
• 4. Check gas type, injectors, gas
valve.
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