Raypak Error PRS: Low Water Pressure / Flow Switch Open
The water pressure/flow switch is open, indicating not enough water is circulating through the boiler. The unit will not fire without proven flow. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The water pressure/flow switch is open, indicating not enough water is circulating through the boiler. The unit will not fire without proven flow.
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 PRS
- Circulator pump not running or weak
- Air trapped in the system (needs purging)
- Closed or restricted isolation valve / dirty filter
- Faulty or misadjusted flow/pressure switch
- Low system water pressure
What you can safely check
- Check the boiler's pressure gauge — if it reads very low, the system may need topping up by a technician
- Listen for the circulator pump running when there is a heat call
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 PRS 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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For your safety and to keep your manufacturer warranty valid, BoilerPart.ca does not sell loose boiler parts over the counter or for self-installation. Under BC regulations, gas appliance components must be installed by a licensed gas fitter. Every part we source is genuine OEM and is professionally fitted, tested, and certified by our Technical Safety BC–licensed technicians as part of a complete repair or installation.
Parts often behind Raypak error PRS
Genuine Raypak parts we supply and professionally install — never for DIY.
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We fit only manufacturer-original (OEM) components so your boiler performs to spec and keeps its factory warranty intact.
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All work is completed by Technical Safety BC–licensed gas fitters (Licence LGA0043870, Boiler Permit LBP0046450). We are fully licensed, bonded and insured for your protection.
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Raypak Error PRS Repair Across Metro Vancouver
Frequently Asked Questions
Fix Raypak Error PRS Today
Licensed Raypak diagnosis and repair with genuine parts — same-day and after-hours across Greater Vancouver.
A Division of CanroHeat.ca · Licensed Gas Fitters · Serving Greater Vancouver since 1985