Giant Error 16: Weak flame current
The control is measuring a weak flame-rectification (flame sense) current. Documented in the Gen 2 (Emerson) Intelli-Vent control; not listed in the Gen 1 guide. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The control is measuring a weak flame-rectification (flame sense) current. Documented in the Gen 2 (Emerson) Intelli-Vent control; not listed in the Gen 1 guide.
Giant fault codes can vary by model and series. Use this as a guide — the same code can have more than one cause. Our Technical Safety BC–licensed technicians read the code, confirm it against your unit's manual, and diagnose the true cause before any repair.
Likely causes of Giant error 16
- Flame sense rod contaminated, oxidized or improperly located
- Flame sense rod needs repositioning or cleaning with an abrasive cloth
- Low voltage to the water heater
- Poor ground / weak rectification path
What you can safely check
- Note the code for the technician (flame-rod cleaning/repositioning is a service task)
- Confirm the unit is on a stable, properly grounded power supply
Beyond these checks, do not open the unit or touch gas/electrical parts — BC law requires a licensed gas fitter. Call us for a proper diagnosis.
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Parts often behind Giant error 16
Genuine Giant parts we supply and professionally install — never for DIY.
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Giant Error 16 Repair Across Metro Vancouver
Related Giant Ignition & Flame Codes
Frequently Asked Questions
Fix Giant Error 16 Today
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