On-demand unit repair
Error code flashing or hot water cutting out mid-shower? Get the fault traced and the heat exchanger cleaned so it runs steady again.
Common faults
Most tankless problems fall into a few groups: scale in the heat exchanger, a clogged inlet filter, gas supply or ignition faults, venting and fan errors, and flow sensors that stop reading.
Tankless repair starts with the error code and the unit's history, then a check of gas pressure or power, flow and the vent. Many calls end with a cleaning rather than new parts.
Symptoms
Hot, then cold, then hot again usually means low flow, a dirty filter or a unit near its minimum flow rate.
Gas supply, a closed valve, an undersized gas line or a worn igniter or flame rod.
Usually scale. Descaling clears many of these without new parts.
A blocked vent, a failed fan motor or a condensate drain backing up.
A loose fitting, a relief valve releasing, or condensate where there should not be any.
Unit undersized for the fixtures in use, or a mixing valve set low.
Pressure
If the cold side is strong but hot water trickles, the water heater side is the place to look. On a tankless unit the usual causes are:
If pressure is low on hot and cold, the cause is elsewhere: a failing pressure-reducing valve, a leak, older galvanized pipe, or the city supply itself.
Upkeep
Tankless water heater maintenance in Houston, Texas mostly means descaling once a year. The plumber closes the isolation valves, pumps a descaling solution through the heat exchanger for about an hour, flushes it and cleans the inlet filter.
Tankless water heater cleaning like this often fixes overheating codes and restores flow. Skipping it shortens the life of the unit.
Error code back again? Get it traced before the heat exchanger fails.
Call (832) 783-9416Repair or replace
Repair usually makes sense for a unit under about 10 years old with a failed sensor, igniter, fan or valve. A cracked or leaking heat exchanger on an older unit is usually the point where replacement wins.
Navien tankless repair, Rheem tankless water heater repair and Rinnai service all follow the same logic, though codes and parts differ by brand. Ask which brands the plumber works on. When a new unit makes more sense, the tankless water heater Houston overview covers sizing and fuel.
Troubleshooting
One reset is fine if the manual allows it. If the code returns, something is causing it and the unit needs a look.
About once a year with Houston water, more often if overheating codes show up.
Usually a clogged inlet filter, scale or a partly closed service valve at the water heater.
A leaking fitting or relief valve is a simple repair. A leaking heat exchanger usually means replacement.
You're put through to a local plumber who diagnoses the unit and quotes the repair.
Send over the brand, model and code on the display, and we'll put you through to a local plumber in Houston, TX.
