Ferroli fault code d 78
Fault code d 78 on a Ferroli boiler (including HR Econpact 3) means: Domestic hot water control temperature too high. 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 d 78 on a Ferroli boiler indicates: Domestic hot water control temperature too high.
Applies to
Ferroli HR Econpact 3, -, HR Econpact, HR Econpact 3HP, HR Econpact 4, HR Econpact 4HP, HR Econpact 5, HR Econpact 50A, HR Econpact 50B, HR Econpact A (135A), 125C, 127A (27A), 127C (27C), 135A (35A), 135C (35C), 225C, 235C.
Matching parts
Ferroli 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 Ferroli 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 Ferroli boiler fault code d 78 mean?
Domestic hot water control temperature too high.
How do I fix fault code d 78 on a Ferroli 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 Ferroli fault code d 78?
That depends on the exact cause. In the Ferroli parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code d 78 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 Ferroli boiler faults and codes at a glance →