VERIFIED
When the water supply was disturbed
A plumber replaced a faucet, the city repaired a main, or a building shut the water off for an afternoon. The next morning the coffee machine shows E39. The code is model-dependent, but a disturbed water supply is a believable background cause for a code related to water behavior. A water-related code can involve the supply, the pump or the sensing that confirms water arrived, so the display alone does not say which.
What changes after a shutoff
Pipes refill with trapped air that sputters out of faucets. Sediment and rust loosen from old pipes, which is common in some older Bay Area buildings. Water can arrive cloudy or tinted for a day. If your machine draws from a tank you fill by hand, the effect is mild. If it is plumbed to a line or a filter, the effect can be stronger.
Check the water first
- Run a kitchen tap for a few minutes and look at the water
- Fill a clear glass and let it stand to see if sediment settles
- Smell the water for anything unusual
If the tap water looks cloudy or tinted, do not use it in the machine until it runs clear.
Machines connected to a line
Where a coffee machine is plumbed in, a closed or half-closed shutoff valve after the repair is a simple cause. Check that the valve under the sink or behind the machine is fully open. A filter cartridge in the line may also hold trapped air or debris.
A hand-filled tank
Empty it, rinse it, and fill with clear water. Run a rinse program and watch the first drops for bubbles or particles. A tank left standing for days can also hold stale water, so a fresh fill is worth doing whatever the cause.
Where a technician looks
The inlet screen and valve, the pump, the filter housing and anything that senses water presence. Fine debris can lodge in a small opening, and removing it needs care. The inlet screen is a fine mesh that catches particles before they reach the valve and pump, so a blocked one can look like a supply fault.
Steps for you
- Let tap water run clear before filling anything.
- Flush the tank, then run a rinse.
- If plumbed in, confirm the shutoff valve is open.
Why a simple tank still matters
Most owners fill a tank by hand, and for them the cause is usually the tank itself or the first rinse. Rust-colored water that entered the tank can leave a film on the inlet screen. Washing the tank with plain water and a soft cloth is enough, with no scrubbing of the valve.
When to book
If E39 persists after clear water and a flush, internal passages may be blocked or the pump may have run dry. A diagnosis comes first, then a written estimate, and nothing is replaced until you give the green light.
Frequently asked questions
Disturbed water can bring air and sediment into the supply, which may affect the machine. Clear water and a flush are the first steps.
Sediment can clog small passages, so wait until the tap runs clear before using it.
At the shutoff valve and any in-line filter, which may be partly closed or holding air.
One or two rinse programs with clear water. If the code persists, arrange a diagnosis.
Model compatibility: Bertazzoni reuses codes across series and model years, so E39 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
