Genuine replacement AP® Master Bottom Board for Expert PN110, PN212 ventilation controller.
The Expert™ Master Bottom Board (also called the bottom PCB) is a replacement circuit board designed specifically for use in the EXPERT PN‑110 (and PN‑212) environmental controllers manufactured by Automated Production. This board manages the control of outputs like relays, fan stages, heating/cooling zones, variable-speed fans, and related logic
Why You’d Need to Replace It:
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Hardware failure: Over time, the relays or circuitry on the bottom board can wear out or burn due to heavy switching loads, power surges, overheating, or electrical shorts. This leads to malfunctioning outputs (e.g., fans/heaters not activating correctly).
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Signal corruption: Faulty boards may result in erratic control of ventilation, heating, or cooling systems—hurting your ability to maintain tight environmental conditions.
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Preventive maintenance: Production facilities often swap in fresh boards proactively to avoid unexpected downtime, especially ahead of critical seasons (e.g., broiler or turkey production).
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Upgrade or repair: If your controller is already disassembled, replacing this board, rather than repairing individual relays or components, can be more reliable and faster.
The master bottom board is your key interface between the PN‑110 processor and real-world devices—drive relays, variable outputs, alarms, and accessories . Its integrity is vital for stable, trouble‑free operation.
When to Consider Replacement:
| Symptom or Trigger | Why It Matters |
|---|---|
| Relays not switching | Board may have failed relays or damaged traces. |
| Erratic control | Faulty signals can lead to overheating or underheating. |
| Frequent controller resets | Short-circuits or board faults may cause protective shutdowns. |
| Age & heavy use | Older boards degrade; replacement avoids runtime issues. |
| During controller maintenance | Swap both board and firmware to minimize variable issues. |
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