Get it serviced. If a service switch has tripped there may be a component failure or circuit issues. Also, gas boilers are required by law to be inspected and serviced annually so if your service light is on or it's overdue for a service, only a licensed tech can service it.
SOURCE: Hi. I have a ST6400S
The only way to get the key sequence is to contact honeywell tech support, they will give you the sequence over the phone as long as you are a contractor (or pretend to be one), but they will not send out any literature on it. If you live in an owner occupier dwelling then it has been fitted by mistake, and the best thing is to replace it.
SOURCE: Installing CM900 Honeywell into Junior 24 Bosch Combi
What kind of boiler are using is this boiler a on the demand electric or gas? You need low voltage wires. If you get me make and model # of off boiler i can try and find wiring diagram . Tell me a little more about you heat system to. Like baseboard heat or in floor how many zones
SOURCE: Our boiler man has suggested the fault with our
Honeywell gas valves are the most commonly fitted type to all domestic boiler brands. Generally, they're very reliable, but like ALL moving parts they can and do fail from time to time.
There are no particular known issues with the VR4605M.
Basically, the best person to diagnose your fault is the qualified and trained person who you've already had looking at it. It then depends upon whether you trust the engineer and only you can decide on that point. Any reputable engineer will be happy to clearly explain the reasoning for diagnosing a faulty gas valve and you can insist on retaining the faulty part in order to get it tested elsewhere if you subsequently have good reason to supect that you were conned into having a perfectly good part replaced.
Obviously, if the engineer is not properly accredited then you're taking a gamble (and in most countries an illegal one) from the outset. Most qualified gas fitters are honest and trustworthy as it ensures further recommendations and repeat business, but that is not the case with the fast-buck cowboys who offer no guarantees for overcharged and dangerous workmanship.
Hope this helps and that you get your heating fixed soon. Please take a moment to rate my answer.
SOURCE: ariston microcombi 23 mffi Boiler Manuals
its the air pressure switch. needs replacing. they are quite cheap but it could be something a little more expensive but you wont know until you replace it. easy half hour fix
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