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Ideal Logic Combi 35 heater & hot water supply (C) Inspectapedia.com BettyIdeal Boiler & Logic Combi Manuals
Parts Lists, Wiring Diagrams, Installation & Service

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Manuals, parts lists, wiring diagrams for Ideal Boilers including the Logic Combi ESP1 series models 24 35 35 heater & instant hot water boiler.

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Ideal Heating Boilers - UK Contact & Manuals (including Logic Combi)

Ideal Logic Combi 35 heater & hot water supply parts explosion or parts list at InspectApedia.com

  • UK Contact: Ideal Heating, Ideal Boilers Ltd., PO Box 103, National Avenue, Kingston Upon Hull, HU5 4JN Tel 01482 492251 Fax 01482 448858 Registration No. London 322 137 UK Web: https://idealheating.com/

    Customer Service: 01482 498660,

    Technical Help: 01482 498663

    Installer technical help line: Tel: 01482 498704

    Ideal Heating is the trade brand for Ideal Boilers sold in the U.K.

    For the very latest copy of literature for specification and maintenance practices visit our website www.idealboilers.com where you can download the relevant information in PDF format.

[Click to enlarge any image]

Error Diagnostic Codes for Ideal Boilers

Be sure to see details about each of these error codes as explained in the manual for your specific heater.

Ideal Boiler Error / Fault Codes
Code Meaning
dU (Logic Combi ESP1) Diverter Valve in mid-position for Service
F (Logic Combi) Boiler frost protection - boiler will fire if temperature is
below 5 degrees C.
FD No water flow
F1 Low water pressure
F2 Flame loss
F3 Fan fault
F4 Thermistor failure
F5 Return thermistor failure
F6 Outside sensor fault
F7 Low voltage (Mains)
F9 Circuit board fault
FA (Logic Combi ESP1)Negative Differential Flow.Return Thermistor
FU (Logic Combi ESP1)Flow/Return Differential > 50°C
L1 Water flow weak or temperature too high or too low
L2 Ignition lockout
L3 No flow, thermistor fault
L4 (Logic Combi ESP1)Flow Thermistor
L5 (Logic Combi ESP1)Return Thermistor
L9 / H9 / HA / LA Same as L1 or (Logic Combi) Unconfigured PCB
LC (Logic Combi ESP1)5 Boiler Resets in 15 Minutes
LF Ignition fault
L56 Return pipe
Too many resets (> 5 in 15 min)
L6 Flame detection fault
C0 Central heating signal failure
C2 Boiler chip card failure

...


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Reader Comments, Questions & Answers About The Article Above

Below you will find questions and answers previously posted on this page at its page bottom reader comment box.

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

Question: Logic Combo 35 Boiler Reset Instructions

How do I reset my logic combo 35 boiler to resume hot water I only have cold.

- Betty, 2022/06/20

This Q&A were posted originally at HOT WATER PRESSURE LOSS

Moderator reply: Logic Combi 35 Boiler Restart Procedure

@Betty,

Thanks for that helpful question.

FIRST try the simple Logic Combi 35 Reset Instructions given by the manufacturer.

Logic Combi ESP1-Series BOILER RESTART PROCEDURE

To restart the boiler press the RESTART button.

The boiler will repeat the ignition sequence if a heat demand is present.

If after that the heater won't run, check the error code on the display at the top of the unit in that little square window.

I don't have a clear image of the error code displayed on your Logic Combi 35 heater photo, but I think I see just an "F" showing

If you don't have the user's manual for your Ideal Logic Combi 35 heater, download this

IDEAL LOGIC COMBI HEATER USERS MANUAL [PDF] at

https://inspectapedia.com/heat/Ideal-Logic-combi-esp1-Manual.pdf

**OR**

Your Logic Combi 35 may be one of the older older Logic Combi boilers before the ESP1-series.

In that manual we see that the "F" code alone signifies

Boiler frost protection - boiler will fire if temperature is below 5 degrees C.

Your heater's display suggests that the right manual for your unit may be the

IDEAL LOGIC COMBI 24,30,35 USERS GUIDE [PDF] (2015) - older models similar to those in the manual just above.

For that boiler here is the reset procedure:

Logic Combi 24 30 35 RESET PROCEDURE

To reset boiler, turn the mode control knob (D) to reset position and immediately turn knob back to required setting.

The boiler will repeat the ignition sequence.

If the boiler still fails to light consult a Gas Safe Registered Engineer or in IE a Registered Gas Installer (RGII).


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