Elco fault code 18
Fault code 18 on an Elco boiler (including Rendamax) means: Faulty manifold sensor. The measured resistance value of the manifold sensor is outside the range of –39 and +110°C. Reset the appliance once. If the code comes back, a part is usually faulty, often a temperature sensor. 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 18 on an Elco boiler indicates: Faulty manifold sensor. The measured resistance value of the manifold sensor is outside the range of –39 and +110°C..
Applies to
Elco Rendamax, R2700, R2701, R2800, R2801, R2900, R2901, R301, R302.
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 €17.95 (€24.95 for more distant countries), usually 3–5 working days.
Based on the cause, these original Elco parts fit (always check the type number of your appliance):
- Rendamax outdoor sensor 1k old no.: RTV015 € 69.26
- Rendamax sensor SPFS DHW E8/KKM8 old no.: RTV070 € 69.26
- Rendamax room sensor RFB old no.: EBA055 € 73.18
Further reading on this cause
Other Elco codes with the same cause
- 12 — Faulty flow temperature sensor. The measured resistance value of the flow temperature…
- 13 — The measured resistance value of the flue gas sensor is outside the range of –10 and…
- 14 — Faulty domestic hot water sensor. The measured resistance value of the domestic hot water…
- 15 — Faulty outdoor sensor. The measured resistance value of the outdoor sensor is outside the…
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 18 mean?
Faulty manifold sensor. The measured resistance value of the manifold sensor is outside the range of –39 and +110°C..
How do I fix fault code 18 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 18?
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 18 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 →