Elco fault code 2/3
Fault code 2/3 on an Elco boiler (including Rendamax) means: Blocking input was interrupted. An external safety device connected to terminals (ST 9.39.4) has tripped. 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 2/3 on an Elco boiler indicates: Blocking input was interrupted. An external safety device connected to terminals (ST 9.39.4) has tripped.
Fixing fault code 2/3: step by step
- Note the exact code and the type of your appliance (see the rating plate).
- Check the water pressure (1.5–2 bar with the system cold) and that the appliance has power.
- Reset the appliance once. If the code comes straight back, do not keep resetting it.
- If the code comes back, choose the matching part below or have a qualified heating engineer take a look.
Applies to
Elco Rendamax, R2700, R2701, R2800, R2801, R2900, R2901, R30/100, R30/120.
Click a model for the parts list and exploded view of that appliance.
Matching parts
Elco 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. These are the parts that most often fit this appliance:
- Rendamax spark plug cap ignition/ionisation electrode old no.: EVD003 € 29.90
- Rendamax outdoor sensor 1k old no.: RTV015 € 72.03
- Rendamax sensor SPFS DHW E8/KKM8 old no.: RTV070 € 72.03
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 Elco boiler fault code 2/3 mean?
Blocking input was interrupted. An external safety device connected to terminals (ST 9.39.4) has tripped.
How do I fix fault code 2/3 on an Elco 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 Elco fault code 2/3?
That depends on the exact cause. In the Elco parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code 2/3 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 Elco boiler faults and codes at a glance →