A tankless unit throwing error codes, failing to ignite, or delivering weaker hot water flow than it used to is often scale buildup on the heat exchanger, a clogged inlet filter, a flow sensor fault, or a venting problem rather than a failing unit. Hard water in Chula Vista, CA speeds up scale buildup, which is why units that go years without descaling tend to show these symptoms first.
If the unit is showing an error code, note it before calling since it narrows down the likely cause. Persistent ignition failures, a gas smell near the unit, or hot water that won't come up to temperature at all are reasons to stop troubleshooting and have someone look at the venting and gas supply directly.
Annual descaling is the single biggest factor in how long a tankless unit lasts. Call (844) 898-0295 and Smart Pro Plumbers will connect you with an independent local plumber in Chula Vista, CA to service it.