Bosch fault code Ed343
Fault code Ed343 on a Bosch boiler (including Compact) means: During heating mode: the temperature of the flue gas sensor rises, but the temperature of the flow temperature sensor does not. Reset the appliance once. If the code comes back, a part is usually faulty, often a temperature sensor. You can check the water pressure and settings yourself; leave work on gas-carrying parts to a certified gas engineer.
After a safety alert (gas, flue gas, combustion), reset no more than once and call in a certified gas engineer. If you smell gas, call your national gas emergency number or 112 immediately.
Cause
Fault code Ed343 on a Bosch boiler indicates: During heating mode: the temperature of the flue gas sensor rises, but the temperature of the flow temperature sensor does not.
Applies to
Bosch Compact, 24 HRC Compact 3, 28 HRC Compact 4, 30 HRC Compact 5.
Matching parts
Bosch parts are available from Instalpunt; shipping to EU countries from €17.95 (€24.95 for more distant countries), usually 3–5 working days.
Based on the cause, these original Bosch parts fit (always check the type number of your appliance):
- Nefit flow / return sensor for ProLine and TrendLine € 17.65
- Nefit flow sensor for TrendLine and ProLine etc. € 17.65
- Nefit pressure sensor with click connection for TopLine and ProLine etc. € 74.49
Further reading on this cause
Other Bosch codes with the same cause
- --341 — The temperature measured by the flow temperature sensor or the return temperature sensor…
- 1022 W — Storage cylinder temperature sensor defective or contact problems
- 1025 W — Return temperature sensor defective
- 1037 W — Outdoor temperature sensor defective, substitute mode heating active
- 1065 W — Water pressure sensor defective or not connected
- 1068 W — Outdoor temperature sensor or lambda sensor defective.
Fix it yourself or call an engineer?
Always consult the manual for your appliance and work safely. If in doubt or if the fault comes back, call in a qualified professional. A question about a part? Write to us at info@instalpunt.nl.
Frequently asked questions
What does Bosch boiler fault code Ed343 mean?
During heating mode: the temperature of the flue gas sensor rises, but the temperature of the flow temperature sensor does not.
How do I fix fault code Ed343 on a Bosch boiler?
First check the cause described above. Then restart the appliance using the reset button. If the message comes back, a part usually needs replacing or the fault needs to be repaired by a qualified professional.
Which parts do I need for Bosch fault code Ed343?
That depends on the exact cause. In the Bosch parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code Ed343 myself?
You can reset the appliance and check things like the water pressure or settings yourself. Work on gas-carrying parts must be left to a certified gas engineer.
All Bosch boiler faults and codes at a glance →