When to ask about this service
- Heater does not activate with water running
- Intermittent heating at low flow
- A model-specific flow fault
What the assessment may involve
Assessment can compare actual flow with the unit’s activation requirement and check filters, restrictions and sensor signals. A low-flow fixture or plumbing issue can imitate a failed sensor.
Options after the problem is identified
A diagnosed sensor or switch fault may be corrected with a compatible replacement. If flow is below the appliance’s requirement, changing the sensor alone will not make the installation suitable.
Limits and safety considerations
Controls must not be bypassed to force the heater to run. The model determines how the flow device is tested and whether it is separately replaceable.
Check whether the heater is recognizing demand
Tell the technician which fixtures activate the heater and which do not. A unit that runs at one outlet but not another may need flow and restriction checks as well as sensor testing. Note whether the fault happens only at low demand or when several fixtures run together. Do not bypass the switch to force operation.
Separate restricted flow from a sensor fault
Filters, supply conditions and fixture restrictions can affect the flow reaching an on-demand heater. Ask whether actual operating conditions were checked before recommending a replacement sensor. A new sensor does not remove a restriction or change the appliance’s minimum activation requirement. The proposed component and testing sequence should match the exact model.
Discuss the expected result
Ask which symptom the replacement is expected to correct and how the unit will be assessed at the affected fixtures. If demand or supply remains outside the model’s operating range, another solution may be needed. Preserve the error details and service findings rather than relying on a reset to decide whether the repair worked.
Service availability in Burlington
Miller and Sons Water Heater Solutions accepts residential and commercial requests. Calls go directly to the owner. Calls accepted 24/7. Visit timing is arranged by phone.
Provide the physical service address and ZIP. Accepted ZIPs are 27215, 27216, 27217; 27216 mailing addresses require physical-location confirmation. Read the coverage details.
A question about tankless flow sensor & switch replacement
Will a sensor replacement improve every low-flow problem?
No. Supply restrictions, filters and fixture demand must be considered before attributing the issue to the sensor.
Why should fixture flow be checked before a sensor is replaced?
A restriction or low demand may prevent normal activation even when a sensor works. Checking operating conditions helps distinguish those issues from a failed component. The model’s requirements remain important after a sensor replacement.
Related service options
- Water Heater Diagnostic & Troubleshooting
- Traditional Tank Water Heater Replacement
- Water Heater System Safety Inspections
Manufacturer information is model-specific. These links do not imply a manufacturer partnership or certification.