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2 port valve 3 port valve heating coming on with hot water

Heating comes on with Hot water

Heating comes on with Heating?

Could be 2 port valve, 3 port valve or actuator issues – Contact us today


Heating systems are an essential component in modern households, playing a crucial role in maintaining comfortable indoor temperatures during chilly days. When it comes to heating systems, one common occurrence that homeowners may encounter is the heating coming on with hot water. This peculiar situation can be attributed to various factors.  Including the functionality of the 2 port valve, 3 port valve, actuator, or even the need for a new head.

In this blog, we will delve into this topic and explore the mechanisms behind it. So, let’s dive in and uncover the mysteries of heating systems operating simultaneously with hot water.


2 Port Valve

To begin with, we must address the role and significance of the 2 port valve. This valve is an integral part of a heating system, responsible for regulating the flow of hot water to the radiators. When the valve malfunctions or becomes stuck, it can result in the heating coming on when hot water is not required, causing discomfort and potential energy wastage. Consequently, ensuring the proper functioning of the 2 port valve becomes paramount in resolving this issue.


3 Port Valve

On the other hand, the 3 port valve serves a slightly different purpose in heating systems. This valve directs the flow of water to either the radiators or the hot water cylinder, depending on the demand for heating or hot water. If the 3 port valve fails, it may cause the heating system to activate unexpectedly when only hot water is needed. Consequently, homeowners should pay close attention to any malfunctioning or inconsistencies in the performance of this valve.



Another crucial component that contributes to the heating system conundrum is the actuator. The actuator is responsible for controlling the movement of the valves, ensuring that they open and close as necessary. However, if the actuator becomes faulty or worn out.  It can result in an imbalance between the valve positions, leading to the heating coming on unintentionally. Therefore, it is imperative to regularly inspect and maintain the actuator to prevent any disruptions in the heating system’s functionality.


Radiators come on with hot water

In certain instances, the need for a new head may arise to rectify the issue of heating coming on with hot water. The head, also known as the port head or valve head, plays a crucial role in regulating the temperature in a room. If the head malfunctions or loses its calibration, it can cause the heating system to activate with hot water unnecessarily. In such cases, replacing the head with a new and properly functioning one can quickly restore the system’s balance.


Call the professionals – Your Heat

Transitioning to a more practical approach.  Let’s discuss potential solutions to rectify this issue. Firstly, homeowners should consider consulting a professional heating engineer.  As they possess the expertise and knowledge necessary to diagnose and resolve heating system malfunctions. These professionals can inspect the valves, actuators, and heads.  Accurately identifying any faults and offering suitable solutions. Moreover, they can provide preventative maintenance advice to avoid future occurrences of heating systems turning on with hot water unintentionally.



Additionally, homeowners can undertake some troubleshooting steps themselves. Checking the wiring connections to valves and actuators, ensuring they are properly secured and undamaged.  Can resolve any electrical issues that might trigger the heating system. Moreover, adjusting the temperature settings on the thermostat.  Ensuring it aligns with the desired room temperature, can help prevent unnecessary activation of the heating system with hot water.


Book an engineer today

In conclusion, the heating coming on with hot water is a common issue faced by homeowners.  Often caused by malfunctioning 2 port valves, 3 port valves, actuators, or faulty heads. To tackle this problem efficiently, consulting a professional heating engineer is advisable. However, homeowners can also undertake their own troubleshooting steps.  Such as inspecting wiring connections and adjusting thermostat settings. By addressing these concerns promptly and effectively, we can restore the harmony within our heating systems.  Ensuring that they operate optimally and provide the desired comfort during chilly days.

Tom Hewitt
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