Grant Relay Mpcbs72 Vortex Combi 26/36

Clear Grant Relay pre Sept. 2008

Grant Relay – MPCBS72

Genuine Control Relay for Grant Vortex Combi 26/36 Boilers

Ensure reliable switching of pumps, valves, and other electrical circuits in your Grant Vortex Combi boiler with the Grant MPCBS72 Relay. This genuine Grant replacement relay sits on the boiler’s PCB, providing the critical on/off switching that controls domestic hot water, central heating pumps, and other safety circuits. When a relay fails—due to wear, pitting contacts, or coil burnout—your boiler can become unresponsive, fail to fire, or suffer intermittent lockouts. The MPCBS72 restores precise, dependable control for uninterrupted heating and hot water service.

 Key Features & Benefits

• Official Grant Part – MPCBS72
  Manufactured to Grant’s exact specifications for guaranteed compatibility and lifespan.

• Multi-Purpose Switching
  Controls pumps, diverter valves, zone valves, and safety interlocks on the PCB.

• Robust Electrical Performance
  Rated for 230 VAC loads with silver alloy contacts for minimal resistance and long service life.

• Direct “Plug-In” Replacement
  Matches the footprint of the original relay—no PCB or wiring modifications required.

• High Cycling Durability
  Designed to withstand thousands of on/off cycles, reducing boiler downtime.

• Protects Sensitive Electronics
  Reduces arcing and electrical noise, safeguarding the boiler’s control board.

 Compatible Grant Boiler Models

The MPCBS72 Relay is used in these Grant Vortex Combi range boilers:

• Grant Vortex Combi 26 kW

• Grant Vortex Combi 36 kW

If you’re unsure whether this relay fits your model, please check the part number on your existing relay or contact our team with your boiler’s serial number for confirmation.

When to Replace the Relay

Consider replacing the MPCBS72 relay if you observe:

• Boiler lockouts or fault codes indicating pump/valve failures

• Intermittent DHW or CH operation despite correct settings

• Audible clicking but no pump activation or valve movement

• Burnt or pitted relay contacts visible upon inspection

• You’re refurbishing the control system during a major service

Timely replacement avoids unnecessary call-outs and restores consistent boiler operation.

Technical Specifications

• Part Number: MPCBS72

• Manufacturer: Grant UK

• Type: PCB-mounted electromagnetic relay

• Coil Voltage: 230 VAC

• Contact Rating: 8 A @ 230 VAC (silver alloy contacts)

• Configuration: SPDT (Single Pole Double Throw) or DPDT depending on board variant

• Mounting: Plug-in socket on control PCB

• Operating Temperature: –20 °C to +70 °C ambient