Pensotti Error E18: Inadequate circulation / heat exchanger obstructed
Documented verbatim on the PNCC-32N (p.73) as 'INADEQUATE CIRCULATION', with listed possible causes 'PUMP MALFUNCTION OR PUMP IMPELLER DIRTY' and 'PRIMARY OR SECONDARY HEAT EXCHANGER OBSTRUCTED' and remedy 'CLEAN OR REPLACE PART'. Water is not circulating well enough through the heat exchanger. Note: on the PCH 50B-H / PCI 34 series the code list jumps E16 -> E22 and does NOT include E18 - this fault applies to the PNCC-32N (and PNCC-class controls), not the Solenne PCH 50B-H. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
Documented verbatim on the PNCC-32N (p.73) as 'INADEQUATE CIRCULATION', with listed possible causes 'PUMP MALFUNCTION OR PUMP IMPELLER DIRTY' and 'PRIMARY OR SECONDARY HEAT EXCHANGER OBSTRUCTED' and remedy 'CLEAN OR REPLACE PART'. Water is not circulating well enough through the heat exchanger. Note: on the PCH 50B-H / PCI 34 series the code list jumps E16 -> E22 and does NOT include E18 - this fault applies to the PNCC-32N (and PNCC-class controls), not the Solenne PCH 50B-H.
Pensotti 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 Pensotti error E18
- Heat exchanger obstructed or scaled/sludged up
- Circulator pump malfunction
- Dirty or jammed pump impeller
- Air trapped in the heat exchanger / system
What you can safely check
- Check system pressure is at least 1 bar and top up if low
- Bleed radiators to remove trapped air
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.
Error E18 usually leaves you without heat or hot water and can indicate a safety-related fault. Don't keep resetting it — call for priority after-hours Pensotti repair.
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Parts often behind Pensotti error E18
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Pensotti Error E18 Repair Across Metro Vancouver
Related Pensotti Water & Flow Codes
Frequently Asked Questions
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