Itho Daalderop fault code 0 geen
Fault code 0 geen on an Itho Daalderop boiler (including KliMax 1) means: High-limit thermostat open. 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 0 geen on an Itho Daalderop boiler indicates: High-limit thermostat open.
Fixing fault code 0 geen: step by step
- Let the appliance cool down.
- Check that the radiator valves and underfloor heating circuits are open, so the water can circulate.
- Read the water pressure on the display or gauge. With the system cold it should be between 1.5 and 2 bar.
- Reset the appliance once. If the code comes straight back, do not keep resetting it.
- If the code comes back, too little water is flowing (pump, sludge in the system) or the overheat thermostat is faulty.
Applies to
Itho Daalderop KliMax 1, HRT 20-22/HRT 20-22 VK, HRT 24-28/HRT 24-28 VKK, HRT 30-36/HRT 30-36 VKK, HRT 36-42, HRT 42-54.
Fault code 0 geen on other Itho Daalderop series
The same code does not mean the same thing on every series. Check the rating plate to see which series you have:
- 0 geen on KliMax 1, HRT 20-22/HRT 20-22 VK, HRT 24-28/HRT 24-28 VKK, HRT 30-36/HRT 30-36 VKK, HRT 36-42, HRT 42-54: Glass fuse F5 faulty.
Matching parts
Itho Daalderop parts are available from Instalpunt; shipping to EU countries from €12.95 (€16.95 for more distant countries), usually 3–5 working days.
For fault code 0 geen, the part involved is usually in the category: thermostat.
This message does not point directly to one faulty part. If the code keeps coming back, view the Itho Daalderop 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 Itho Daalderop boiler fault code 0 geen mean?
High-limit thermostat open.
How do I fix fault code 0 geen on an Itho Daalderop 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 Itho Daalderop fault code 0 geen?
That depends on the exact cause. In the Itho Daalderop parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code 0 geen 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 Itho Daalderop boiler faults and codes at a glance →