You bought the tankless unit for endless hot water. Now you're standing in a cold shower watching an error code blink on the wall, wondering what went wrong. That's a frustrating place to be, especially on a busy morning.
Here's the thing most folks don't hear when they buy one: tankless heaters and Colton's hard water don't get along. The Inland Empire pushes mineral-heavy water through your pipes, and that scale settles right on the heat exchanger where the burning happens.
We fix tankless units across Colton every week, from Cooley Ranch to South Colton. Error codes, no-hot-water calls, weak flow, the cold-water sandwich. We read the code, find the real cause, and give you a straight answer on whether it's a quick fix or something bigger.
Why Your Tankless Heater Quits in Colton
Almost every tankless problem we see here traces back to one of two things: scale or a sensor. The hard water common across the Inland Empire leaves chalky mineral deposits inside the heat exchanger. As that scale thickens, water can't move through fast enough, the unit overheats, and it throws a code to protect itself. Left alone, scale shortens the life of an expensive machine.
The other half is sensors and ignition. Flame rods get coated, flow sensors stick, and air-intake or exhaust faults trip the safety shutoff. A blinking code like 11, 12, or 90 isn't random — each one points somewhere specific. We pull the code, test the actual part, and confirm the cause before we touch a screwdriver.
When the culprit is scale, the fix is a descaling flush. We circulate a cleaning solution through the heat exchanger to dissolve the buildup and bring your flow and temperature back. When it's a failed igniter, flow sensor, gas valve, or control board, we replace the part and retest. Either way you get an upfront price first — no surprise at the end.
Signs Your Tankless Unit Needs Attention
- An error code flashing on the unit or remote — 10, 11, 12, 90, or similar
- Water runs hot, then cold, then hot again (the cold-water sandwich)
- Hot water flow has dropped to a trickle even with the tap wide open
- The unit clicks trying to ignite but never fires up
- Rumbling or popping sounds from inside the heater during a hot draw
- It's been two-plus years and the unit has never been flushed for scale
