As a ground source heat pump owner, you will already be aware that the system is significantly more complex than a fossil fuel boiler, with energy transfers taking place throughout the system. Knowing what is happening at each stage and controlling all these energy transfers is a key aspect for setting and maintaining efficiency throughout the system. You will have several sensors placed around your system – in the flow and return of the brine side, in the heating and hot water buffer tanks and on the heating flow and return pipework. You will even have one on the external wall if your system is run by a weather compensated unit or on other distribution systems such as swimming pools.
Each individual sensor has a key role to perform, as the heat pump control unit relies on them to regulate the number of compressor start ups, which is the foundation for efficiency through the system. False readings can lead to overworking the compressor, incorrect actual temperature flows and false alarms which cause the heat pump to turn off in order to protect itself. We have often been to site to find that a sensor is placed in the wrong position, which sounds like a simple error but demonstrates the need to have competent renewables engineers who understand how the system works to both install and maintain the system.
Replacing a faulty sensor itself is normally a straightforward operation. However, it requires a large amount of expertise to investigate and understand which sensor has failed, especially when readings are false as opposed to zero. Our engineers understand the control mechanisms on a wide range of heat pump units and so are usually able to resolve electrical issues during one site visit. Testing each sensor individually can be a painstaking process, depending on the complexity of the system, and so if they require a further site visit they will explain to you what steps they have taken and why a return visit is necessary. We only use replacement sensors of the highest quality.
Investigating for a faulty sensor is just one of the many checks that our comprehensive annual service will carry out. If you know that your system has been performing at a higher degree of efficiency then you are currently achieving then please contact one of our team. Our engineers pride themselves on investigating and establishing what the root cause of any heat pump failure is, so whether that be a faulty sensor or any other underlying issue they will not leave you with an under-performing system.