Frequently Asked Questions

Error codes indicate specific problems: ignition failure, flame loss, flow issues, overheating, or venting problems. The exact meaning varies by manufacturer (Navien, Rinnai, Rheem, Noritz, Takagi).

Most manufacturers recommend annual descaling, especially in hard water areas. Regular maintenance prevents buildup that reduces efficiency and can damage the heat exchanger.

Some issues like cleaning the inlet filter or checking valves can be DIY. But many codes indicate problems requiring professional diagnosis—failed sensors, gas valves, or igniters.

Common causes: ignition failure (burner won't light), flow restriction (mineral buildup), component failure (gas valves, sensors), or venting issues causing safety shutdowns.

Temperature cycling can result from mineral buildup, flow sensor issues, gas pressure problems, or exceeding the unit's maximum flow rate with multiple simultaneous uses.

Simple repairs: 1-2 hours. Descaling: 1.5-2.5 hours. Component replacement: 2-4 hours. Complex issues may require ordering parts and a return visit.

We service Navien, Rinnai, Rheem, Noritz, and Takagi. Call to discuss other brands.

Consider: age (15-20 year lifespan), nature of failure (single component vs. heat exchanger), repair cost vs. replacement, and maintenance history. We'll give honest advice.