Shower mixer valve not working

Hello, I understand the technical frustration you're facing with the shower mixer valve issue. Based on your description, the problem seems to stem from a fault within the mixer valve mechanism, which is not uncommon in new installations, especially within the first year of use. Here's a more technical perspective on your situation: Mixer Valve Mechanics: The mixer valve regulates the temperature by balancing hot and cold water inputs. If turning the dial doesn't change the temperature, it suggests a malfunction in the thermostatic cartridge within the valve. This is a replaceable component, but it's a technical task that requires specific plumbing skills. Guarantee and Warranty: Most plumbing fixtures come with a manufacturer's warranty, often covering a period of 1-2 years. Since your installation was only 5-6 months ago, it's highly likely that this issue should be covered. The warranty typically covers the replacement of faulty parts like a thermostatic cartridge. Installation Responsibility: If the fault is due to installation error, the bathroom fitter or company is responsible for rectifying the issue. This falls under the workmanship guarantee, which usually accompanies professional installation services. Documentation Review: Check any detailed invoices or documentation you received post-installation. These documents often list the specific models of fixtures installed and their respective warranty periods. They may also outline the terms of the workmanship guarantee. Contacting the Manufacturer: If you have the make and model of the shower mixer, contacting the manufacturer could provide clarity on the warranty status. They might also offer technical advice or direct you to an authorized service provider. Next Steps if Unresponsive Fitter: If the original fitter remains unresponsive, you might consider having another qualified plumber inspect the issue. They can provide a technical assessment, which could be useful if you need to escalate the matter either with the original fitter or through legal channels. Repair vs. Replacement: A skilled plumber can advise whether the valve can be repaired (e.g., by replacing the thermostatic cartridge) or if it needs complete replacement. This decision is often based on the specific model and the nature of the fault. It's crucial to establish the cause of the fault – whether it's a product failure or an installation issue – as it directly affects who is responsible for the repair costs. Persist in your attempts to contact the original fitter, as they should be your first point of resolution. If you need to seek alternative help, ensure you choose a certified professional to maintain any existing warranties or guarantees. I hope this technical insight helps guide your next steps in resolving the shower mixer valve issue. Best regards.

The shower should be under warranty for a minimum of 12 months, depending on the make of the mixer unit, you might be able to speak to the manufacturer directly and supply the invoice from the fitter as proof. Regarding the fault, it’s either broken but it could be the screw is loose. On the end of the the knob there should be a cover, if you carefully remove this with something thin like a Stanley knife you can see if the screw is lose inside, if it is, tighten this and that should solve the issue.

You should contact the manufacturer who provided the shower you have 12month warranty, I have had this issue before the manufacturer sent out a new thermostat for the shower, if it’s a riser shower the fitter should do it for free but if your have a concealed shower the thermostat behind tiles he may charge a small fee for fix the problem

Find the brand of thermostatic mixer, contact them but the installer should still answer the phone.