Raypak Error HL1 / HL2: High-Limit Lockout
Water temperature exceeded the high-limit safety setpoint and the limit tripped, shutting the unit down. On digital heaters this shows as HL1/HL2 (HL1 manual-reset, HL2 auto-reset); on Hi Delta it reads 'Man Hi Limit Fault'/'Auto Hi Limit Fault'; on XTherm it reads 'LIMIT TRIP'. Caused by low/restricted water flow, blocked tubes, weak circulator, or a high-limit sensor fault. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
Water temperature exceeded the high-limit safety setpoint and the limit tripped, shutting the unit down. On digital heaters this shows as HL1/HL2 (HL1 manual-reset, HL2 auto-reset); on Hi Delta it reads 'Man Hi Limit Fault'/'Auto Hi Limit Fault'; on XTherm it reads 'LIMIT TRIP'. Caused by low/restricted water flow, blocked tubes, weak circulator, or a high-limit sensor fault.
Raypak 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 Raypak error HL1 / HL2
- Low or restricted water flow through the heat exchanger
- Dirty filter, closed/restricted valve, or air-bound system
- Failed or weak circulator pump
- High-limit sensor/thermostat fault
- Other tripped safety while not in heating mode (can falsely trigger HL1/HL2)
What you can safely check
- Check the system pressure gauge is in the normal range (typically ~12-25 psi cold)
- Make sure no isolation valves to the boiler were accidentally closed
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 HL1 / HL2 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 Raypak repair.
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Parts often behind Raypak error HL1 / HL2
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Raypak Error HL1 / HL2 Repair Across Metro Vancouver
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