Are you having trouble with a faulty Sime boiler?
Having a faulty boiler is an annoyance at the best of times, especially when you don’t know how serious the problem actually is and whether or not you need to call an engineer.
This blog post details some of the most common faults you can experience with a Sime boiler, to help you diagnose the problem and understand what the solution entails – there may even be a couple of easy fixes you can try yourself.
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NOTE: If you’re ever in any doubt, or the problem isn’t an easy fix like adjusting boiler pressure or unblocking a frozen condensate pipe, DO NOT try to fix the problem yourself; always call a Gas Safe registered engineer.
About Sime boilers
The company Sime had its beginnings as an Italian manufacturer of heat exchangers, before starting to manufacturer its own gas boilers back in 1973. Sime had some very popular combi boilers which it sold through merchants from the early ’90s and 2000s, and although they’re still around today, they aren’t quite as popular.
I suspect the drop in popularity may also have something to do with the company manufacturing a lot of commercial boilers nowadays, although Sime combi boilers were generally very reliable and reasonably priced.
Fault 1: Printed circuit board fault
There was a major faults with Sime boilers back in August 2013, which affected the Sime 80C, 100C and 110C and caused a number of effected boilers to overheat and become potentially dangerous.
A necessary modification was required for these boilers, and a report issued from the HSE and Gas Safe detailing that any affected boiler must be taken out of operation until it was updated and fitted with a safety thermostat.
However, some of the boilers affected may not have been registered or serviced, and the original home owners may have moved on, so it’s definitely contacting Sime to check if your boiler is affected.
The Fix: If it’s suspected that your Sime boiler is experiencing this fault, my advice is to turn it off and isolate the appliance from the gas, as it could be a serious fire hazard. Please follow the advice given on the HSE website.
Fault 2: Diverter valve failure
If you’re only getting hot water when your heating is on, or your hot water tap is only running lukewarm, it could be a problem with a faulty diverter valve. We’ve actually written an entire blog post on how to diagnose this specific problem.
The Fix: Your chosen gas engineer can either replace the diverter valve, or dismantle the valve to replace the diaphragm washer and spindles inside.
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TIP: A common problem was getting water on the electrics whilst removing pumps or diverter valves due to the position of the electrical box on Sime boilers, which is why I always place a plastic sheet and towel over the electrics before working on them.
Sime Friendly Format 80e Boiler User Manual DownloadFault 3: Boiler pressure too high and climbing higher
This was a common problem I often came across on the Friendly and Super 90 models. I can’t be sure if it was a manufacturing issue or a corrosion issue, but the plate heat exchanger was splitting, causing the cold water to cross over and fill the heating circuit. The tell tale sign being that the pressure gauge would get higher even if the pressure was released and the filling loop disconnected. It’s like the pressure is getting higher by itself.
The Fix: The only solution I know of is to replace the plate heat exchanger, which can easily be done by your chosen heating engineer.
Fault 4: Boiler is losing pressure
If your boiler is losing pressure, and you’ve checked the radiators, pipework and safety valve to find no leaks, the most common fault is a faulty auto air vent which is leaking.
The Fix: The auto air vent can be removed and replaced by an engineer, before refilling and repressurising the system (which is as simple as turning the filling loop until the boiler reaches 1.5 bar).
Fault 5: Boiler failing to ignite
If the pilot is igniting, yet the main burner is not firing up, it could be a problem with the electrics. I find this is a common issue after electrical work has been carried out by kitchen fitters or homeowners adding plug sockets. Usually down to negative polarity, which happens when live and neutral wires are crossed.
The Fix: Test the boiler on a multi-meter to see if the neutral wire at the boiler is live. Get a qualified electrician to thoroughly check and fix the electrics.
Consider a replacement
If you own a Sime Friendly, 90, 90 or 102, these boilers are now between 15 and 20 years old. It may not be cost-effective to repair them, and they also aren’t high efficiency condensing models, so could be costing you more in energy than you necessarily need to pay.
It may be worth looking into seeking a replacement, especially if you’re consistently experiencing faults and problems with your old Sime boiler.
Conclusion
I hope this blog has helped you to diagnose and troubleshoot your faulty Sime boiler – just remember to call an experienced gas engineer unless it’s simply a matter of repressurising your boiler or defrosting a condensate pipe.
Sime Friendly Format 80e Boiler User Manual 2016
Are you experiencing a problem with your Sime boiler that I haven’t mentioned on this list? Either leave a comment below or get in touch with me directly – I’ll be happy to help!
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