Job location: Heath, TX
A residential tankless water heater that wasn't producing hot water was diagnosed with error codes 12 and 63. The technician cleaned heavy soot and debris from the burner assembly, then reprogrammed the unit's parameters to eliminate the recirculation pump error code. After multiple test runs, the water heater operated properly and consistently.
Key Facts
- Service: Water Heater
- Location: Heath, TX
- Technician: Evan
- Completed: October 23, 2026
Called out for a tankless water heater not producing hot water. Upon arrival, we gave the customer pricing on running diagnostics. After approval, we started our diagnostics. The unit threw error codes 12 and 63.
We started by taking apart the burner assembly. We discovered that there was heavy soot and debris built up on the burners. We cleaned those off and put everything back together. We reinstated the water to check for proper operation. That was the cause of the issue.
We wanted to address code 63, which was for the recirculation pump. This house does not have a recirculation pump, so we reprogrammed the parameters for the unit to get rid of that error code. We ran the unit multiple times for 30 minutes, checking for proper operation and consistency. We cleaned our work area. Pictures attached.
Service area: Rockwall, Royse City, Rowlett, Garland, Plano, Highland Park, University Park
Hours: Available 24/7 — no overtime charges
Licensed: TX Master Plumber #41106. Fully licensed and insured.
Credentials: BBB A+ Rated · Family-Owned Since 1970
Contact: (214) 729-3586
Serving customers since 1970.