Slant/Fin Error Hold 63 / Alert 128: LCI OFF
Hold 63 (LCI OFF — Limit Control Input) and Alert 128 (modulation rate was limited due to IAS open) are both documented as caused by an incorrect SOLA controller, with the corrective action 'Replace control with correct model.' These indicate the installed control does not match the application configuration. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
Hold 63 (LCI OFF — Limit Control Input) and Alert 128 (modulation rate was limited due to IAS open) are both documented as caused by an incorrect SOLA controller, with the corrective action 'Replace control with correct model.' These indicate the installed control does not match the application configuration.
Slant/Fin 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 Slant/Fin error Hold 63 / Alert 128
- Incorrect / wrong-model SOLA controller installed
- Control configuration does not match the boiler application
- Replacement control not matched to the CHS application
What you can safely check
- Most likely after a control swap — note any recent control replacement for the technician
- Confirm the replacement control part number matches the boiler model
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 Slant/Fin error Hold 63 / Alert 128
Genuine Slant/Fin parts we supply and professionally install — never for DIY.
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Slant/Fin Error Hold 63 / Alert 128 Repair Across Metro Vancouver
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