Thermal flow sensor Therm C

A thermal flow sensor is a component of the combustion/heating system in heated pressure washers, responsible for detecting/monitoring flow conditions in the heater operating area. In service practice, this sensor is important for safe start-up and stable heating operation-its signal can be a prerequisite for proper burner operation and control logic.

MPN / reference: 12610

Kit includes:

• 43445
• 448481
• 14217
• 14219
• 14218
• 12603
• 44216
• 12604
• 405942
• 142181
• 12636
• 12637
• 12635

APPLICATION

The sensor is used in typical service work on heated washers:

• replacing a faulty flow sensor in the combustion/heating system,
• diagnosing heating start-up issues or intermittent heating operation,
• restoring correct heater operation after control-component failures,
• servicing machines used intensively (workshop, wash bays, industrial use).

SYMPTOMS - WHEN IT’S WORTH REPLACING

Consider replacing the sensor when you notice:

• heating does not start despite correct operating conditions,
• heating operation is interrupted or unstable (after ruling out fuel and ignition),
• the machine enters a safety/protection mode related to the heating system,
• sensor fault confirmed by electrical/service diagnostics,
• visible damage to wires, connectors, or the sensor body.

HOW TO CHOOSE THE RIGHT PART

Selection should be unambiguous:

• confirm you need a thermal flow sensor,
• verify the manufacturer number: MPN 12610,
• compare sensor markings with the removed part (variants may differ in parameters and connector type),
• base selection on the service documentation for the machine/combustion system.

For heating control components, the correct variant is critical-an incorrect sensor can trigger wrong safety behavior.

COMPATIBILITY

Select the sensor based on MPN 12610 and compatibility with the combustion/heating system in the specific machine. Treat “Therm C” as a variant designation that should be confirmed in service documentation and by comparison with the removed sensor.

[faq]

Does “no heating” always mean the flow sensor is faulty?|No. No heating can have many causes (fuel, ignition, safeties, power supply, control). The flow sensor is suspected especially when heating won’t start despite correct conditions and diagnostics point to flow detection.

What does “thermal” mean in the sensor name?|It indicates a sensor principle related to thermal effects used to assess operating conditions (including flow). For selection, the key is the correct variant designation and part number.

Can the sensor cause intermittent heating (works sometimes, doesn’t other times)?|Yes. If the sensor is unstable or has an electrical-connection issue, the controller may “see” missing conditions and shut heating down.

Can I use a different sensor variant if the plug fits?|Not recommended. Even with a similar connector, sensors can have different operating parameters. The safest selection is by MPN 12610.

What should I check when replacing the sensor?|Wiring and connectors, cleanliness of the mounting area, and overall heating-system diagnostics (power, control, and actual flow conditions). Faults are often multi-factor, not only the sensor.

[/faq]