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A combi boiler heats the water inside of the system and gives instant hot water when you turn on a hot tap. The water which stays in the boiler is coming straight from the mains. This system is extremely energy efficient since it only heats the water when you demand it. These types of boilers are great for homes with one bathroom. A central heating system might be ideal for homes with multiple bathrooms.
If you are experiencing the 30 degrees light flashing, it means no hot water or heating in the system. The power light will be on, but resetting cannot work since it locked out itself. The system will keep trying to fire up but due to the problem, it cannot heat the water as it supposes to be.
You need to check the gas supply if it is turned on you should check other gas appliances. The Central Heating System’ pressure must stay in the green section of the gauge which is normally placed between 1 and 2.5 bars. If it is low, please add some water to repressurize it. The red flame failure will show us the event of the burner. When the burner cannot fire up, it can occur from blockage of the condensate drain or lighting. You should try resetting the safety thermostat or flame failure. Before you reset the whole system, turn the selector anti-clockwise against the pressure and press the reset button for two seconds. If after the boiler turns on or off, again and again, You should contact a Service Engineer as soon as possible.