(Solved) Bosch Greenstar Combi 151 Problems

To help you understand the common Bosch Greenstar Combi 151 problems this article discusses 5 of the most common issues with their solutions.

The Bosch Greenstar Combi 151 is one of the best boilers to get on today’s market. And it’s crucial to understand the common problems that Bosch Greenstar Combi can have if you have one of these boilers in your home.

Although not all boiler malfunctions necessitate the assistance of a professional, knowing the common issues and problems that may occur will save both your time and money. It might even save your boiler from further malfunctioning.

Common Bosch Greenstar Combi 151 Problems And Reasons

No.	Probable problems	Easy solution
1	Leak in the Boiler	Consult with Gas Safe Engineer
2	Low pressure of the boiler	Find out the failed joints and seal it
3	Unusual noise in the boiler	Stop overheating the water
4	Stop heating water	Increase the pressure gauge
5	Condensate pipe frizzing	Thawing out and insulating contents of the pipe
6	No power supply on the heater	Replace PCB (circuit board)
7	Faults in radiator	Use a chemical flush to reduce sludge, dirt
8	Stop responding to the thermostat.	Replace the battery
9	The pilot light keeps turning off.	Take the help from an expert or clean the carbon deposits
10	Not no hot water in the boiler.	Turn on the central heating switch

Problem 1: No Heating Or Hot Water

If your boiler stops doing what it was supposed to do, providing your home with warmth and heated water, it can get quite frustrating. What you need to do to solve this is to determine the cause and then solve it.

Solution

• If this problem is occurring because of low pressure, then you have to examine whether the pressure goes below or not. If it is, it will need to be repressurized.
• If a malfunction in the boiler’s thermostat is causing erratic heating or hot water, you should check the boiler’s manufacturer’s documentation for a potential fix; if you don’t find any issue, contact the manufacturer for assistance.
• We recommend contacting a certified engineer if these solutions don’t work since issues like a damaged motorized valve or a malfunctioning diaphragm would necessitate professional assistance.

Problem 2: A Faulty Pilot Light

This also happens due to various problems. You need to examine whether the issue can be solved by yourself or whether you need a professional.

Solution

• If you’re confident in changing this light, you might try to relight the pilot light on your own. But while doing that, you need to go through the boiler’s handbook for specific instructions.
• Before you begin, make sure the gas stopper is turned on. Also, check if the supply of gas is proper. You can double-check this by examining your other gas appliances.
• If you see a problem in the gas supply, to resolve this problem, it is best to consult a Gas Safe certified engineer.

Problem 3: Leaking Boiler

If the leak is occurring through the pressure valve, the boiler system’s pressure is probably too high. If the leakage is due to a malfunctioning of the pump seal, the seal may have worn out. But corrosion is to blame for a leak that has occurred around the boiler system’s pipes. So there can be various solutions.

Solution

• If the issue is corrosion, there might be a problem with the installation of the boiler. We recommend you seekingan aid of a skilled one who can help you find and resolve this problem.
• Almost all leak issues will need an engineer. The engineer might suggest that you get a new boiler set up if, somehow, the leak is caused by a severe malfunction.

Problem 4: Low Boiler Pressure

By looking at the installed pressure sensor on the boiler, you can generally tell if the pressure is below the average point. You can usually fix the pressure at 1.5 bar. If it was less than one, your boiler would not work correctly.

Solution

You can start by looking for visual indicators of a leak, but you must not dismantle any casing. We recommend contacting an engineer if you notice a leak. If you can’t find a leak, you can repressurize the boiler if you’re confident in doing so. What you need to do is:

• Allow the boiler to fully cool before turning it off.
• Find the boiler’s key and fit it in the hidden tray just below the boiler.
• Then, ensure the key is aligned with the given “open padlock” indication before inserting it inside the groove.
• Then, as the key is now firmly inserted, flip it to the “closed padlock” indication.
• You should now be able to hear the water flowing in the boiler when you twist the square (white-colored) nut clockwise.
• Continue doing so until the pressure reaches 1.5 bars.
• Next, when the water stops flowing, rotate the same nut clockwise.
• Return the key to the indication that says “open padlock.” Some water may leak out, but this isn’t a problem.
• Then re-start the boiler system.

Problem 5: Boiler Noises

It’s typical for a boiler to make little noise while it’s running, particularly when it’s first starting up. But, if a boiler starts making strange gurgling, pounding, or whistling noises, it needs to be repaired.

Solution

Depending on the sound, you can try the following steps:

• Due to trapped air in the system, you can hear a gurgling noise, which will require bleeding of the radiator to release the air.
• A gurgling noise indicates your boiler has low pressure; just work on increasing pressure.
• Too much heating can create a banging noise, which will need to cool down the boiler.
• In times of kettling, you will need an engineer to fix your boiler noise.

This Video Will Help You Too!

Frequently Asked Questions (FAQs)

Conclusion

Knowing the Bosch Greenstar Combi 151 problems will help you identify the problems before your boiler malfunctions even more.

When the problems are small, Fixing them can save a lot of money and give your boiler longevity. So the next time you see any of these problems, don’t delay. Immediately identify the issue, fix what you can, or call an expert to help you fix your Bosch Greenstar 151 problems.

You Can Also Read:

• Why Is My Boiler Drain Valve Leaking?
• Crown Boiler Troubleshooting- Why is my Crown Boiler Malfunctioning?
• Boiler Pressure Relief Valve Keeps Going Off- Why & How to Fix
• Williamson Boiler Problems And Their Easy to Bite Fixes
• Pilot Light On But No Hot Water

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