NIBE alarm code 304
Alarm code 304 on a NIBE heat pump (including S series) means: Internal error OPT: GBM alarm. This fault is caused by the gas boiler and is reset automatically. 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 304 on a NIBE heat pump indicates: Internal error OPT: GBM alarm. This fault is caused by the gas boiler and is reset automatically.
Applies to
NIBE S series, -.
Matching parts
NIBE parts are available from Instalpunt; shipping to EU countries from €17.95 (€24.95 for more distant countries), usually 3–5 working days.
This message does not point directly to one faulty part. If the code keeps coming back, view the NIBE parts:
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 NIBE heat pump alarm code 304 mean?
Internal error OPT: GBM alarm. This fault is caused by the gas boiler and is reset automatically.
How do I fix alarm code 304 on a NIBE heat pump?
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 NIBE alarm code 304?
That depends on the exact cause. In the NIBE parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code 304 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 NIBE heat pump faults and codes at a glance →