Also your servicing idea of shorting out APS ( safety device ) to make things work and removing brass drain off parts to get things to work worries me.
If you are profesionally involved in the heating industry wouldn't you be better asking on ARGI or Gas-news on another site primarily for professionals rather than a DIY site ?
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local