Baxi Duo Tec Flame Detection Electrode Kit 720222901 Replacement Part

This baxi duo tec flame detection (ionisation) electrode detects the burner flame signal so the boiler can run safely without cutting out. When the electrode is worn, contaminated or failing, you can get flame failure lockouts, the boiler firing then stopping, or unstable heating and hot water. Replacing it with the correct 720222901 electrode kit restores reliable flame sensing and helps reduce nuisance shutdowns.

Compatibility :

• Duo Tec HE: 24 HE, 24 HE A (After BTG0815 Issue 9), 24 HE A (Before BTG0815 Issue 9), 28 HE, 28 HE A (After CAC0929 Issue 9), 28 HE A (Before CAC0929 Issue 9), 33 HE, 33 HE A (After BTH1112 Issue 9), 33 HE A (Before BTH1112 Issue 8), 40 HE, 40 HE A (Issue 8)
• Duo Tec Combi ErP: 24 Combi ErP (AC Issue 3, BC Issue 2, CC, DC), 28 Combi ErP (AC Issue 3, BC Issue 3, CC, DC), 33 Combi ErP (AC Issue 3, BC Issue 2, CC, DC), 40 Combi ErP (AC Issue 3, BC Issue 2, CC, DC)
• HE System: 15 HE System, 18 HE System, 24 HE System (After BTF 0932), 24 HE System (Before BTF 0932), 28 HE System (After CAB 1112), 28 HE System (Before CAB 1112), 32 HE System
• Megaflo HE A: 15 HE A, 18 HE A, 24 HE A, 28 HE A, 32 HE A
• System ERP: 15 System ERP (IN AC Issue 3, IN BC, IN CC), 18 System ERP (IN AC Issue 3, IN BC, IN CC), 24 System ERP (IN AC Issue 3, IN BC, IN CC), 28 System ERP (IN AC Issue 3, IN BC, IN CC), 32 System ERP (IN AC Issue 3, IN BC, IN CC)
• Combi HE: 24 HE, 28 HE, 33 HE
• Platinum Combi HE: 24 HE, 24 HE A (After BMY0815 Issue 6), 24 HE A (Before BMY0815 Issue 6), 28 HE, 28 HE A (After BNC0932 Issue 7), 28 HE A (Before BNC0932 Issue 7), 33 HE, 33 HE A (After BNE1112 Issue 5), 33 HE A (Before BNE1112 Issue 6), 40 HE, 40 HE A (Issue 4)
• Combi ERP: 24 Combi ERP (CC, DC, EC, IN AC Issue 2, IN BC Issue 2), 28 Combi ERP (CC, DC, EC, IN AC Issue 2, IN BC Issue 2), 33 Combi ERP (CC, DC, EC, IN AC Issue 2, IN BC Issue 2), 40 Combi ERP (CC, DC, EC, IN AC Issue 2, IN BC Issue 2)

Important fitting advice

We recommend that all parts are fitted by a fully qualified Gas Safe registered engineer. If you need help confirming the right part, contact us our team has 10+ years of boiler spares knowledge and friendly chat support to help you quickly.

Delivery

At Boiler Spares Hub, we dispatch orders within 1 working day (Monday-Friday). Orders placed outside working days will be dispatched on the next working day. For delivery options available for this product, please add it to your basket or check our delivery options page.

Returns

We accept 30-day returns. Returns must be in an unopened, sealed box. If we find the item has been used or installation was attempted, we may refuse the return.

Frequently Asked Questions (FAQ’s)

1. What is baxi duo tec flame detection electrode?
A flame sensing (ionisation) electrode kit used to prove the burner flame on compatible boilers.

2. What does an ionisation electrode do?
It detects the flame signal; if the signal isn’t correct, the boiler shuts down for safety.

3. What symptoms can a faulty flame sensing electrode cause?
Flame failure lockouts, burner lighting then going out, repeated resets, or intermittent hot water/heating.

4. Is this the same as an ignition electrode?
No-ignition electrodes create the spark; ionisation electrodes confirm the flame is present (some boilers use separate parts).

5. Can dirt or soot cause the same issue?
Yes-carbon build-up and contamination can weaken the flame signal and trigger shutdowns.