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MCS Quality Audit – Has Anyone Had One? Did It Lead to Remediation?

Papahuhu · 2026-04-15T14:56:07Z

Was contacted earlier this week by MCS, requesting to perform a quality audit on my ASHP and PV system. Has anyone been through this process and did it result in any remediation from the installers, where they hadn’t maintained compliance with standards please? Thereby making the process effective and value adding.

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Air Source Heat Pumps (ASHPs)

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ASHP-BOBBA

(@ashp-bobba)

Honorable Member Member Professional Installer

Joined: 1 year ago

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15/04/2026 8:46 pm

Posted by: @papahuhu

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@ashp-bobba

Thats interesting thanks. So they were more concerned about building regs/safety issues rather than MCS regs, I can see some logic behind that, pressurised system regs are there to prevent injury or worse. How often are you supposed to replace the pressure relief valve please and does anyone ever do it? I guess it’s designed to fail open, as opposed to closed.

So under part G or the G3 rules you have a responsibility as the home owner to make sure the hot water system remains safe, this would likely involve following the manufacturers instructions which mostly recommend servicing the system once per year, now this is not a legal requirement and is not mandated by law, If you are a landlord or a hot water cylinder at you company you are mandated to this though. So for a private home owner this is more down to insurance, for example, if in the unfortunate event your tank manages to explode, pull the ceiling down and land on a guest lets say, you would likely not be insured under your home insurance due to negligence (basically not having the system service) which probably accounts for 75% of private homes.

An installer and or maintenance company must be qualified to touch a cylinder by law, so next time you have someone fixing it make sure they are G3 qualified this is a rule, this is also a separate qualification to plumbing or heating, gas or oil, it is specific to cylinders.

There is no fixed timeline for age deterioration, there is no fixed calibration testing available in the field so the checks are a function test and reseal test a feeling test, if the spring feels warn you change it, if it does not open properly you change it, if it leaks or weeps you change it, these valves are £30 and can be changed in an hour or quicker.

Most valves last 5-10 years with no issues, if there is scale in the system as soon as you test these valves on year 1 they break and the get changed, so the rule is just function and feel, inspection and test.

This post was modified 17 minutes ago by Mars

AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.
Professional installer. Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.

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