Then the manufacturers are at fault. Agile seems to be better informed.
As to the "bodge" of concealling a bridge rectifier in the lead and "forgetting" to mention it. Beggars believe, but then people who make boilers seem to lack some basic electronic knowledge.
How does the DC coil in the gas valve like being fed raw DC ?
The DC output from a bridge rectifier fed with 50 Hz AC is raw DC, that is DC but pulsed at 100 pulses per second.
Hence the magnetic field in the gas valve solenoid is pulsing at 100 pulses per second. Mechanical inertia of the mechanism seems to prevent the gas valve opening and closing 100 times a second.
If the solenoid in the gas valve is not designed to withstand continuous pulsing by raw DC then the effect of the pulsing on the winding of the coil may be significant and may lead to premature failure of the gas valve solenoid.
That said it might be just a single diode and the gas valve is being fed 50 pulses and 50 gaps per second. Even worse.
This applies to any coil designed to be operated by smooth DC coil but fed with raw DC.[/QUOTE
So tell me what good is that information when you still have to replace the lead anyway , you've got to know it's in there first of which a lot of manufacturers dont tell pertinent info ( or wrong info )@anyway and people wonder why we tell them to leave it to an engineer and they get shirty about it