Ideal
Ideal Ionisation Probe Lead 172204
Ideal 172204 ionisation probe lead (HT lead) for Ideal Commercial Concord and related boiler models, carrying the flame-sensing signal to the control board.
At a glance
- Part type: HT leads / spares - electrode
- Also known as IONISATION-PROBE-LEAD-8358-4905, 1178587
£448.64
£373.87 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Ideal 172204 ionisation probe lead is an HT lead that connects the ionisation probe to the boiler control board on Ideal Commercial appliances. The ionisation probe sits in the burner flame path and returns a small current through this lead; the board reads that signal to confirm a flame is established and to keep the gas valve open. A sound lead is therefore essential to reliable ignition and continued running.
Signs this part needs replacing
- The boiler fires and then locks out shortly afterwards, with the flame signal dropping out.
- Repeated ignition attempts with no sustained flame detection.
- Intermittent lockouts that clear on reset but return during the same heating cycle.
- Visible damage to the lead: cracked or brittle insulation, scorching, or a loose crimped terminal at the probe or board end.
- Fault codes or diagnostic readings pointing to a weak or absent ionisation current.
Before you order
- Confirm the appliance model and serial number against the compatibility list, as several Concord variants use different leads.
- Check the existing lead against the previous number 8358-4905 before ordering, since older stock may be marked with that reference.
- Inspect the ionisation probe and its electrode condition at the same time, as a worn probe can produce the same symptoms as a faulty lead.
- Work on the appliance should be carried out by a competent person, with the boiler isolated and made safe before the lead is disturbed.
Mechanical
| Part type | Spares - Electrode |
|---|
Compliance
| Manufacturer part number (MPN) | 172204 |
|---|---|
| Barcode / EAN | 5022141722042 |
| Commodity code | 8544 42 90 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | IONISATION-PROBE-LEAD-8358-4905, 8358-4905, 1178587 |
| Previous numbers | 8358-4905 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| IDEAL COMMERCIAL CONCORD ES140/H CPT P/A | — | — | — | |
| IDEAL COMMERCIAL CONCORD ES140/H CPT U/A | — | — | — | |
| IDEAL COMMERCIAL CONCORD ES160/H CPT P/A | — | — | — | |
| IDEAL COMMERCIAL CONCORD ES160/H CPT U/A | — | — | — | |
| IDEAL COMMERCIAL CONCORD ES180/H CPT P/A | — | — | — | |
| IDEAL COMMERCIAL CONCORD ES180/H CPT U/A | — | — | — | |
| IDEAL COMMERCIAL CONCORD ES200/H CPT P/A | — | — | — | |
| IDEAL COMMERCIAL CONCORD ES200/H CPT U/A | — | — | — | |
| IDEAL COMMERCIAL CONCORD ES220/H CPT P/A | — | — | — | |
| IDEAL COMMERCIAL CONCORD ES220/H CPT U/A | — | — | — |
Showing 10 of 28 compatible appliances.
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.
IDEAL COMMERCIAL appliance manual — CONCORD ES140/H CPT P/A, CONCORD ES140/H CPT U/A, CONCORD ES160/H CPT P/A, CONCORD ES160/H CPT U/A, CONCORD ES180/H CPT P/A, CONCORD ES180/H CPT U/A, CONCORD ES200/H CPT P/A, CONCORD ES200/H CPT U/A, CONCORD ES220/H CPT P/A, CONCORD ES220/H CPT U/A, CONCORD ES260/H CPT P/A, CONCORD ES260/H CPT U/A, CONCORD ES300/H CPT P/A, CONCORD ES300/H CPT U/A, CONCORD ES340/H CPT P/A, CONCORD ES340/H CPT U/A, CONCORD ES380/H CPT P/A, CONCORD ES380/H CPT U/A
manualmanualIDEAL COMMERCIAL appliance manual — CONCORD ESi 140 CPT U/A, CONCORD ESi 160 CPT U/A, CONCORD ESi 180 CPT U/A, CONCORD ESi 200 CPT U/A, CONCORD ESi 220 CPT U/A, CONCORD ESi 260 CPT U/A, CONCORD ESi 300 CPT U/A, CONCORD ESi 340 CPT U/A, CONCORD ESi 380 CPT U/A
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