Red Devil Fan simulator 4pin 4p for Oil Immersion Cooling - Short Mini Version
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Red Devil 4-pin Mini Fan Simulator for Immersion-Cooled ASIC Miners
The Red Devil mini fan simulator is an independent-core 4-pin spoofer that feeds a stable RPM signal back to a miner's control board when the original cooling fans are removed — typically for petrochemical oil immersion cooling, single-phase dielectric immersion, or bench testing.
It works on any ASIC that uses a standard 4-pin fan header, including Antminer, Innosilicon and Ebit models. The mini form factor saves space inside crowded immersion tanks and avoids the dangling wiring of full-size simulators.
Specifications
| Parameter | Value |
|---|---|
| Part number | Red Devil mini fan simulator 4-pin |
| Condition | New - mini version |
| Category | Fan simulator / RPM spoofer |
| Connector | 4-pin |
| Installation | Plug-and-play, no firmware change required |
| Function | Simulates fan speed feedback to controller board |
| Brand compatibility | Antminer, Innosilicon, Ebit (any 4-pin fan header) |
| Primary application | Oil / dielectric immersion cooling, bench test rigs |
| Form factor | Short mini version |
Why use a fan simulator on immersion-cooled miners
When an ASIC is submerged in dielectric fluid, the mechanical fans are removed because they cavitate the oil and add useless drag. Without a fan signal on the control-board header, the firmware refuses to boot or shuts the miner down with a "fan error". The Red Devil simulator returns a synthetic RPM pulse to satisfy that check, letting the miner run normally on immersion cooling.
Installation
Power off the miner and disconnect the fan harnesses. Plug one Red Devil mini simulator into each 4-pin fan header that was previously occupied by a physical fan. Verify each simulator is fully seated and reapply power. The miner should boot without a fan-error alert. No firmware patch or BIOS modification is needed.
Compatibility
Works with any ASIC miner that exposes a standard 4-pin fan connector on the control board. This includes Antminer S/T/L series, Innosilicon A/T series and most Ebit E-series miners. For miners that use 6-pin linear fan headers (such as older Whatsminer M20 / M21), use the 4-in-1 fan simulator listed in related products instead.
Common failure symptoms (when no simulator is fitted)
- Miner boots, then shuts down within seconds with "fan error" in the log
- Controller refuses to start hashing after fans are removed for immersion
- Dashboard reports 0 RPM on one or more fan positions
- Hashboards never reach target temperature because the firmware halts startup
- Repeated reboot loop when running the miner outside its original air-cooled chassis
Frequently asked questions
Will one simulator be enough for a 4-fan miner?
No. Each fan header on the control board needs its own simulator. A miner with four fan headers needs four Red Devil simulators.
Does it work for water-cooled (hydro) miners?
Hydro miners typically keep their original fan harness logic; check the model first. The Red Devil is primarily designed for fan-free immersion or bench-test setups.
Is it safe in dielectric oil?
Yes. The simulator is small, sealed and uses standard PCB components that tolerate dielectric immersion in the same way miner control boards do.
Do you ship internationally?
Yes. We ship worldwide from our Shenzhen warehouses, with DDP available for US and EU customers.
Related products
- 4-in-1 Fan Speed Simulator for Antminer / Iceriver
- Antminer S21 / T21 Fan Speed Simulator
- Antminer S19k Fan Simulator (Immersion)
- Whatsminer 4-pin Fan Simulator for Immersion Cooling
- Avalon 1246 / Lovecore Fan Simulator
- Whatsminer PSU Fan Simulator P21 / P221 / P222
Contact contact@lys-sz.com for volume pricing or compatibility questions.
Worldwide shipping from our Shenzhen warehouses.
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