Bosch fault code d7
Fault code d7 on a Bosch boiler (including ZSN and ZWN) means: Gas valve defective or modulation cable not connected. 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 d7 on a Bosch boiler indicates: Gas valve defective or modulation cable not connected.
Fixing fault code d7: step by step
- Check that the gas valve at the appliance is open and that other gas appliances, such as the hob, are getting gas.
- Reset the appliance once. If the code comes straight back, do not keep resetting it.
- If the code comes back, the problem is the gas supply or the gas valve. Work on gas-carrying parts is for a qualified heating engineer.
- Smell gas? Close the gas valve, open windows and doors and call the gas emergency service straight away.
Applies to
Bosch ZSN, ZWN, 24-7 KE.
Matching parts
Bosch parts are available from Instalpunt; shipping to EU countries from €12.95 (€16.95 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 Bosch 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 Bosch boiler fault code d7 mean?
Gas valve defective or modulation cable not connected.
How do I fix fault code d7 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 d7?
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 d7 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 →