Ideal
Ideal PCB KM821 I2 Kit
Printed circuit board kit for Ideal Logic, Logic Max and Independent gas boilers, controlling boiler operation and sequence.
Showing prices
£175.19
£145.99 ex. VAT · VAT at 20%
Out of stock — order for next delivery
Call 01302 279234 to check availability
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The PCB KM821 I2 Kit is a printed circuit board manufactured by Ideal for use in its gas boiler ranges. It serves as the main control board, managing boiler sequence, firing and safety functions across the Logic, Logic Max and Independent families.
Signs this part needs replacing
- Boiler fails to fire or does not respond to a demand for heat or hot water
- Repeated lockouts or fault codes that clear only temporarily
- No display, blank screen or unresponsive controls on the boiler fascia
- Fan, pump or ignition sequence not running when called
- Intermittent operation that cannot be traced to another component
Before you order
- Confirm the boiler model against the fit list above before ordering
- Check the part number and markings on the existing board
- Confirm whether the kit format is the correct version for your boiler variant
- Isolate the electrical supply before removing or fitting any board
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| IDEAL INDEPENDENT + COMBI 24 | 47-349-27 | 47-349-27 | — | — |
| IDEAL INDEPENDENT + COMBI 30 | 47-349-28 | 47-349-28 | — | — |
| IDEAL INDEPENDENT + COMBI 35 | 47-349-29 | 47-349-29 | — | — |
| IDEAL INDEPENDENT COMBI 24 | 47-349-24 | 47-349-24 | — | — |
| IDEAL INDEPENDENT COMBI 30 | 47-349-25 | 47-349-25 | — | — |
| IDEAL INDEPENDENT COMBI 35 | 47-349-26 | 47-349-26 | — | — |
| IDEAL INDEPENDENT SYSTEM S15 | 41-750-69 | 41-750-69 | — | — |
| IDEAL INDEPENDENT SYSTEM S18 | 41-750-70 | 41-750-70 | — | — |
| IDEAL INDEPENDENT SYSTEM S24 | 41-750-71 | 41-750-71 | — | — |
| IDEAL INDEPENDENT SYSTEM S30 | 41-750-72 | 41-750-72 | — | — |
Showing 10 of 53 compatible appliances.
Fitment listings are a guide, not a guarantee. Plant-room assemblies get modified on site more often than not. Send us the GC number off the data badge and a photo of the existing valve and we will confirm before anything is dispatched.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
manual
IDEAL appliance manual — INDEPENDENT + COMBI 24 (GC 47-349-27), INDEPENDENT + COMBI 30 (GC 47-349-28), INDEPENDENT + COMBI 35 (GC 47-349-29)
manualmanualIDEAL appliance manual — INDEPENDENT COMBI 24 (GC 47-349-24), INDEPENDENT COMBI 30 (GC 47-349-25), INDEPENDENT COMBI 35 (GC 47-349-26)
manualmanualIDEAL appliance manual — INDEPENDENT SYSTEM S15 (GC 41-750-69), INDEPENDENT SYSTEM S18 (GC 41-750-70), INDEPENDENT SYSTEM S24 (GC 41-750-71), INDEPENDENT SYSTEM S30 (GC 41-750-72)
manualmanualIDEAL appliance manual — LOGIC + HEAT H12 (GC 41-750-82), LOGIC + HEAT H15 (GC 41-750-83), LOGIC + HEAT H18 (GC 41-750-84), LOGIC + HEAT H24 (GC 41-750-85), LOGIC + HEAT H30 (GC 41-750-86)
manualmanualIDEAL appliance manual — LOGIC + SYSTEM S15 (GC 41-750-65), LOGIC + SYSTEM S18 (GC 41-750-66), LOGIC + SYSTEM S24 (GC 41-750-67), LOGIC + SYSTEM S30 (GC 41-750-68)
manualmanualIDEAL appliance manual — LOGIC COMBI C24 (GC 47-349-18), LOGIC COMBI C30 (GC 47-349-19), LOGIC COMBI C35 (GC 47-349-20)
manualmanualIDEAL appliance manual — LOGIC COMBI ESP1 24 (GC 47-349-21), LOGIC COMBI ESP1 30 (GC 47-349-22), LOGIC COMBI ESP1 35 (GC 47-349-23)
manualmanualIDEAL appliance manual — LOGIC HEAT H12 (GC 41-750-77), LOGIC HEAT H15 (GC 41-750-78), LOGIC HEAT H18 (GC 41-750-79), LOGIC HEAT H24 (GC 41-750-80), LOGIC HEAT H30 (GC 41-750-81)
manualmanualIDEAL appliance manual — LOGIC MAX HEAT H12 (GC 41-796-17), LOGIC MAX HEAT H15 (GC 41-796-18), LOGIC MAX HEAT H18 (GC 41-796-19), LOGIC MAX HEAT H24 (GC 41-796-20), LOGIC MAX HEAT H30 (GC 41-796-21)
manualmanualIDEAL appliance manual — LOGIC MAX SYSTEM S15 (GC 41-796-13), LOGIC MAX SYSTEM S18 (GC 41-796-14), LOGIC MAX SYSTEM S24 (GC 41-796-15), LOGIC MAX SYSTEM S30 (GC 41-796-16)
manualmanualIDEAL appliance manual — LOGIC SYSTEM S15 (GC 41-750-61), LOGIC SYSTEM S18 (GC 41-750-62), LOGIC SYSTEM S24 (GC 41-750-63), LOGIC SYSTEM S30 (GC 41-750-64)
manualmanualIDEAL appliance manual — i MINI C24 (GC 47-349-30), i MINI C30 (GC 47-349-31)
manualmanualKESTON appliance manual — SYSTEM S30 BOILER (GC 41-930-45)
manualNo technical questions yet for this part.
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