A Rinnai 805000039 Ionisation Wire monitors flame presence to maintain safe ignition feedback within the heating and cooling setup.
The ionisation wire detects the burner flame and relays that signal to the control system so the boiler can confirm safe ignition and sustain proper heating cycle performance. Its construction matters because reliable conductivity and heat-resistant insulation support accurate flame sensing in a demanding heating and cooling system environment.
The ionisation wire may be wearing out if the boiler shows ignition faults, intermittent burner shutdowns or inconsistent flame detection during operation. Physical signs can include frayed insulation, corrosion or discoloration and environmental exposure to heat, moisture or combustion residue may also reduce sensing reliability in the heating and cooling unit.
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We provide the option to return most new, unopened real OEM heating and cooling replacement parts within 90 days of delivery, so go to our Returns page and see if your order qualifies. If the part has already been installed and no longer works, please fill out the form in the Defective Parts & Warranty Inquiries section.