Bosch Boiler: Leaking water
Water around a Bosch boiler can be a discharging pressure-relief valve (overpressure), a blocked or split condensate line, or a failing seal, fitting or heat exchanger. Water on live electrics or a hot heat exchanger is a safety issue.
Water around a Bosch boiler can be a discharging pressure-relief valve (overpressure), a blocked or split condensate line, or a failing seal, fitting or heat exchanger. Water on live electrics or a hot heat exchanger is a safety issue. On Bosch boilers, this is linked to 3 fault codes (CE, H07, A1). Below are the likely causes, the safe checks you can make, and exactly what our licensed BC gas technicians do — because boiler repair in British Columbia is licensed gas work, not a DIY job.
Boiler repair is licensed gas work in BC. The checks below are the safe limit of DIY. Do not open the boiler or work on gas, combustion or safety controls — read the fault code, reset at most once, and call a licensed technician if it returns.
What you might notice
- Pressure gauge reading low (or very high)
- No heat; boiler will not fire
- Needing to top up system pressure often
- No or weak heat
- Overheat or flow faults under load
- Pump running but rooms stay cold
Safe checks you can make first
These are the only steps a homeowner should take. If they don’t resolve it, stop — the rest is licensed gas work.
- 1Identify where the water comes from — top, bottom, condensate pipe, or a fitting
- 2Check pressure: above ~30 psi suggests an expansion-tank / PRV fault
- 3Place a container to catch water and protect the floor
- 4Always call — do not run a leaking boiler near electrical components
Related Bosch fault codes
These Bosch codes are commonly behind “leaking water”. Tap any code for its full meaning, causes and fix.
What our licensed technicians do
- Locate leaks across the heat exchanger, pump, valves and fittings
- Test and recharge or replace the expansion tank to the correct pre-charge
- Inspect the pressure-relief valve and auto air vents
- Refill, purge air and confirm stable cold/hot pressure
- Test circulator-pump operation and speed
- Purge trapped air and check for air-bound zones
Bosch leaking water — FAQ
Why is my Bosch boiler leaking water?
Water around a Bosch boiler can be a discharging pressure-relief valve (overpressure), a blocked or split condensate line, or a failing seal, fitting or heat exchanger. Water on live electrics or a hot heat exchanger is a safety issue. The related Bosch fault codes are CE, H07, A1. A licensed technician confirms the true root cause with the right instruments before any repair.
Is it safe to keep resetting my Bosch boiler when it shows "leaking water"?
Reset it at most once. If "leaking water" returns, the boiler is telling you there is a real fault that needs diagnosing — continuing to reset it can make things worse. Call GasBoilers.ca at 604-359-1081 and a licensed technician will find the cause.
Can you repair a Bosch boiler with this problem in Greater Vancouver?
Yes. Our Red Seal–certified, TSBC gas-licensed technicians diagnose and repair Bosch Greenstar and Singular series across Vancouver, Burnaby, Surrey, Richmond, the Tri-Cities and the rest of Greater Vancouver. Same-day appointments are often available — call 604-359-1081.
“Leaking water” on other boiler brands
Bosch boiler leaking water? We can help today.
Licensed, Red Seal–certified gas technicians across Greater Vancouver. Upfront pricing, same-day service available.