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Check the pressure reading, should be about 1 bar when system is cold. Various models in the range of 24cdi. If you do not have a manual, go to, http://www.centralheating.co.uk/Boiler-Manuals/worcester-bosch-boiler-manuals/worcester-bosch-discontinued-boiler-manuals. Get the manual for your unit, to wards the end of install manual it has a fault finder, Also has a basic 1 in the user manual. Number of flashes how fast the light flashes which one flashing can all mean different, So get the manual and check, Some parts are easy to fix, as long as you do not touch the gas side the rest is plumbing. Come back if needed.
Symptoms sound like crossover might be part of problem: Crossover is when cold water enters hot water line due to faulty plumbing part like check valve, mixing valve, or bad faucet cartridge. http://waterheatertimer.org/Crossover.html
This could well be a fan relay fault on the pcb, as in if the fan is cutting in and out it's triggering the pressure switch which in turn is sending confusing signals to the ignition and gas valve. Have you removed the controls connector cover and observed the righthand of the two little white boxes in the middle of the control board (pcb) with the boiler switched on? (be careful because it's live i.e DO NOT TOUCH ANYTHING) Is it sparking?
3 psi is a little over the average, 2.5 is the optimum setting. If it empties itself, it means that the safety valve is working,which prevents any kind of damage to pipes etc...Make sure the valve is open and close at the right time and top up the system slowly rather than in a hurry. If the system requires regular top up then there must be a small leak somewhere, so it is best if you can fix that too. Remember that there are some solutions that are added to the water circulation and if you are constantly topping up with water then you are losing these solutions that prevents rust build up etc...Hope this helps.
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Hi, this is Worcester, Bosch Group
Although we don't currently offer live technical support online, our Technical
Support department will be able to help. Their number is 0844 892 3366 -
they're open 6 days a week and on average answer calls within 20 second. If you
want to know more about our Technical Support department visit our website http://www.worcester-bosch.co.uk/homeowner/customer-service/customer-technical-support