# 21476514 Thermo Monitor | Genuine Volvo Penta Part

## 🔧 Product Description

A temperature monitoring component used in a Volvo Penta instrument, alarm or engine-protection system. It must be selected by exact part number because the switching point and electrical logic are application specific.

## ⚙️ Key Features

-   Genuine Volvo Penta temperature monitor
-   Designed for alarm and engine-protection circuits
-   Factory-calibrated operating threshold
-   Marine or industrial sealed electrical construction
-   Exact connector, thread and switching logic must match
-   Engine type: Electronically monitored Volvo Penta marine or industrial diesel

## 🔌 Function

Monitors engine or coolant temperature and provides the signal used by the instrument or protection system.

## ⚠️ Common Signs of Failure

-   Incorrect or missing temperature display
-   False over-temperature alarm
-   Alarm fails during a functional test
-   Engine derate or shutdown with normal temperature
-   Open-circuit, short-circuit or communication fault

## 🛠️ Service Notes

-   Check the replacement is the one specified for your engine and for its electrical system voltage before fitting; monitoring units are built for a particular system and are not interchangeable on appearance
-   Isolate the batteries before disconnecting it and note the connections so it goes back exactly as it came off
-   Make the terminals off clean and tight with a good earth, and protect the connections against damp — a corroded terminal or poor earth gives false readings and false alarms
-   Where the unit screws into a housing or waterway, use only the sealing washer or thread treatment the workshop manual for your engine specifies; extra sealant can upset both the seal and the earth path
-   After fitting, run the engine up and satisfy yourself the reading or warning behaves sensibly against a known good reference before relying on it at sea

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21476514 → Supersedes 21294573

### OEM / Related Numbers

-   21294573 earlier number superseded by this part

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

- **Price:** 2328.51 AUD
- **Vendor:** Volvo Penta
- **Type:** Instruments & Gauges
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2328.51 AUD | In stock |

## Images

- 21476514 Thermo Monitor | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21476514-thermo-monitor-genuine-volvo-penta)
> Updated: 2026-10-12