Bosch fault code 8C374
Fault code 8C374 on a Bosch boiler (including Compact) means: Insufficient ionisation current has been measured during burning more often than permitted. Reset the appliance once. If the code comes back, a part is usually faulty. 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 8C374 on a Bosch boiler indicates: Insufficient ionisation current has been measured during burning more often than permitted.
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.
For fault code 8C374, the part involved is usually in the category: electrode.
This message does not point directly to one faulty part. These are the parts that most often fit this appliance:
- Nefit seal burner plate DN196 € 12.42
- Nefit burner seal DN220 for ProLine € 13.73
- Nefit flow / return sensor for ProLine and TrendLine € 17.65
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 8C374 mean?
Insufficient ionisation current has been measured during burning more often than permitted.
How do I fix fault code 8C374 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 8C374?
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 8C374 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 →