I wind blew out the pilot light on my boiler, I have followed the re-lighting instructions i/e turn grey button on solinoid valve untill resistance is felt, release it and wait 3 mins, nothing happens tried severall times. A spark comes from the igniter, how can I test to see if the valve is working ok. Urgent advise needed as we have 3 grand children staying with us and all under 5 years of age.