Astralpool / Hurlcon Gas Heater PCB - for MX, JX, HX Gas Heaters
Astralpool / Hurlcon Gas Heater PCB - for MX, JX, HX Gas Heaters is backordered and will ship as soon as it is back in stock.
Don't Guess - Ask Us!
Don't Guess - Ask Us!
Not sure if it’s the right part? Send us a message and a photo of what you’re replacing, or what you need, and we’ll help make sure you get the right part the first time.
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Delivery and Shipping Info*
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Astralpool / Hurlcon Gas Heater PCB - for MX, JX, HX Gas Heaters
Astralpool / Hurlcon Gas Heater PCB - for MX, JX, HX Gas Heaters is backordered and will ship as soon as it is back in stock.
Astralpool
Thermostat Control Pad PCB – Genus 4 (4-Button)
Physically Kept in Stock – Fast Shipping Australia-Wide
Replacement Thermostat Control Pad PCB Circuit Board for all Hurlcon and AstralPool gas heaters with 4-button control panels, manufactured after 2001. This Genus 4 (V4) version replaces all earlier versions and displays temperature, error codes, and heater status.
Has both Slow Comms for older Genus systems, and Fast Comms for Connect 10. Comes as PCB. Facias & Overlays (stickers) can also be purchased.
Does not suit Hurlcon hydronic boilers with similar PCB.
Suits Hurlcon & Astralpool Gas Heaters after 2001:
- HX Series: HX 70, HX 120, HX 150
- MX Gas Heaters: MX 125, MX 150, MX 200, MX 250, MX 300, MX 350, MX 400, MX 500
- JX Gas Heaters: JX 130, JX 160
- WX Wilton Gas Heaters: WX 70, WX 75, WX 120
May also be labeled:
- 70280 / SP70280 Genus 4 by Fabtronics
- HEAT10.PCB Genus 4
- HEAT13.PCB Genus 4
- WWDG G4
- Genus 4 - replaces V1, V2, V3, V4
- P/N A814073-000
- P/N A814073-001
- P/N A814073-002
- Genus4 Heater CTL
- 16F888ITN09-0779-0000
- 0927240622 B 504073-000 0701002969
- Genus <-- only on heaters
- Genus 2 <-- only on heaters
- Genus 3 <-- only on heaters
- Hurlcon 2.3
- B814073-002 / B814073-003
- 1833388694 / 1833388488
- Also called heater control board or display board panel.
Note:
Some older Hurlcon heaters may have only 3 buttons on the label, but has a cutout on the back for the 4th Pool/Spa button. You will need to replace the Sticker/Label on these. If you don't have a cut-out, replace the facia and overlay.
Older Thermostats:
Older analogue and digital thermostats can be found here.
Replacement Labels / Decals:
We strongly recommend replacing the label / sticker / decal when replacing the PCB, as some of the older ones were not UV Resistant. The "sticky" part also perishes when exposed to sun & weather over long periods of time.
Manufacturer Catalogues, Diagrams & Part Numbers
Need exploded views, spare part numbers, product numbers, diagrams, or more product information? See the manufacturer catalogues: AstralPool Catalogue 2026 | Zodiac Catalogue 2026
In plumbing, named sizes are not the actual measurements. A pipe called “50mm” or “2"” does not measure 50 mm across. Instead, it follows nominal sizing, an internationally-standardised naming system.
Use the Outside Diameter (OD) to check your pipe against fittings. Below is a quick reference for common spa & pool pipe sizes:
| Imperial Name | Metric Name | Pipe Diameter (OD) |
|---|---|---|
| 1/2" | 15mm | ~21.2–21.5 mm |
| 3/4" | 20mm | ~26.6–26.9 mm |
| 1" | 25 mm | ~33.4–33.7 mm |
| 1.5" | 40 mm | ~48.1–48.4 mm |
| 2" | 50 mm | ~60.2–60.8 mm |
| 2.5" | 65 mm | ~75.2–75.5 mm |
These are nominal sizes and are designed to fit matching fittings — not to measure exactly what their name suggests. These are based on PVC Pressure Pipe AS/NZ 1477 Dimensions1.
- º Internal diameters vary slightly by manufacturer and class.
- 1 Not all pool/spa fittings match these dimensions exactly. Some do not follow Australian or international standards. Chinese spas may use proprietary fittings.
Understanding Plumbing Sizes & Nominal Measurements
Plumbing sizes can be confusing. PVC and many other pipe systems use nominal sizes—the size is a name, not the exact measured dimension. This convention is used across most pool and spa systems so that pipes and fittings remain compatible.
Why pipe sizes don’t match the measurements
The Nominal Pipe Size (NPS) system standardises pipe dimensions so that pipes, fittings, valves, and accessories interoperate. Plumbers work with these nominal names every day, but DIYers can be tripped up if they try to match by a tape-measure alone.
How to Measure Pipe Correctly
-
Pipe size is identified by:
- The pipe’s Outside Diameter (OD).
- The fitting’s Inside Diameter (ID) (socket opening).
- Pipe Class / Schedule (e.g., Class 9, 12, 18 or Sch 40) relates to wall thickness and therefore the Internal Diameter (ID) and pressure rating.
- The outside diameter of a fitting is not useful (wall thickness varies by manufacturer).
Hose & Tube Dimensions
Common flexible hose sizes used in pool/spa systems (approximate IDs).
| Imperial Name | Metric Name | Inside Diameter (ID) |
|---|---|---|
| 3/8" | 9–10 mm | ~9 mm |
| 3/4" | 19 mm | ~19 mm |
BSP – British Standard Pipe Thread Sizes
BSP thread names are also nominal. The thread OD will not equal the nominal name.
| BSP Thread Size Naming | Outside Diameter (mm / inch) | TPI |
|---|---|---|
| 1/16" BSP | 7.7 mm / 0.304" | 28 |
| 1/8" BSP | 9.7 mm / 0.383" | 28 |
| 1/4" BSP | 13.16 mm / 0.518" | 19 |
| 3/8" BSP | 16.66 mm / 0.656" | 19 |
| 1/2" BSP / 15 mm | 20.99 mm / 0.825" | 14 |
| 5/8" BSP | 22.99 mm / 0.902" | 14 |
| 3/4" BSP / 20 mm | 26.44 mm / 1.041" | 14 |
| 7/8" BSP | 30.20 mm / 1.189" | 14 |
| 1" BSP / 25 mm | 33.25 mm / 1.309" | 11 |
| 1-1/4" BSP | 41.91 mm / 1.650" | 11 |
| 1-1/2" BSP / 40 mm | 47.80 mm / 1.882" | 11 |
| 2" BSP / 50 mm | 59.61 mm / 2.347" | 11 |
| 2-1/4" BSP | 65.71 mm / 2.587" | 11 |
| 2-1/2" BSP | 75.18 mm / 2.960" | 11 |
| 3" BSP | 87.88 mm / 3.460" | 11 |
| 4" BSP | 113.03 mm / 4.450" | 11 |
| 5" BSP | 138.43 mm / 5.450" | 11 |
| 6" BSP | 163.83 mm / 6.450" | 11 |
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SP70280