Blue Diamond MaxiBlue Reservoir Sensor (Spare Part) | C21-013
Blue Diamond MaxiBlue Reservoir Sensor (Spare Part) | C21-013
Blue Diamond MaxiBlue Reservoir Sensor (Spare Part) — C21-013
The Blue Diamond C21-013 MaxiBlue Reservoir Sensor is a genuine Charles Austen Pumps replacement sensor kit for BlueDiamond® MaxiBlue condensate removal pumps. It replaces unreliable mechanical float switches with solid-state thermistor technology — delivering maintenance-free, fail-safe condensate management for air conditioning and refrigeration systems.
How It Works
- Water collection: The plastic reservoir sits inside or just below the AC unit to catch falling condensate droplets.
- Solid-state sensing: Thermistor technology detects water level without any mechanical float — immune to slime, algae, and dirt build-up.
- Pump trigger: When water rises to the trigger level, the sensor signals the MaxiBlue pump to run. Once the tank is empty, the pump shuts off automatically.
Key Features
- No moving parts — maintenance-free, no float to clog or stick
- Fail-Safe Alarm (FSA) — built-in relay shuts down the AC unit on overflow, preventing water damage
- Plug-and-play — pre-wired 2m cable connects directly to the MaxiBlue pump control port
- Genuine Blue Diamond / Charles Austen Pumps spare part
- MaxiBlue compatible only
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | C21-013 |
| Brand | Blue Diamond / Charles Austen Pumps |
| Compatibility | MaxiBlue |
| Sensor Type | Thermistor Sensing |
| Dimensions | 90 × 40 × 30mm |
| Cable Length | 2m (6.5 ft) |
What's Included
- 1 × Blue Diamond C21-013 MaxiBlue Reservoir Sensor
Frequently Asked Questions
Is this compatible with MegaBlue or MiniBlue pumps?
No — the C21-013 is designed specifically for the MaxiBlue condensate pump. For MegaBlue, see the C21-008 MegaBlue Reservoir Sensor.
Is this a genuine Blue Diamond part?
Yes — the C21-013 is a genuine Charles Austen Pumps / Blue Diamond spare part, not an aftermarket replacement.
Does this include the complete pump?
No — this is the reservoir sensor only, sold as a spare or replacement part. It does not include the MaxiBlue pump.