Laars Error 20: Condensate Drain Trap Fault
The condensate drain trap circuit is open (closed is normal). The control reads this as a condensate fault and stops the boiler to avoid condensate backing up into the unit. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The condensate drain trap circuit is open (closed is normal). The control reads this as a condensate fault and stops the boiler to avoid condensate backing up into the unit.
Laars 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 Laars error 20
- Blocked or kinked condensate hose / drain line
- Full or frozen condensate trap
- Blocked vent pipe causing condensate backup
- Faulty condensate switch or wiring
- Failing main control
What you can safely check
- Look for water pooling around the boiler or a visibly kinked/blocked condensate drain hose
- If you have a condensate pump, check it has power and is not full
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 20 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 Laars repair.
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Parts often behind Laars error 20
Genuine Laars parts we supply and professionally install — never for DIY.
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Laars Error 20 Repair Across Metro Vancouver
Frequently Asked Questions
Fix Laars Error 20 Today
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