Post By Dimal
Post By Lyrebird
Post By Dimal
Rocket Giotto- Pump will not always start when switching machine on
I recently bought a used rocket Giotto. it is about 6 years old and always has been serviced on time.
In the manual, it say that the pump will start and run for few seconds, once turning the machine on.
Is sometime does. But also sometime doesn't. No pattern I have noticed.
Anyone experienced a similar issue?
Any advice on what to check and if it is indeed not an expected behaviour?
That's absolutely normal mate.
It's just the boiler water being topped up when ever the level drops below the sensing probe.
The water level drops when ever you use Steam or Hot Water...
Originally Posted by Dimal
Thanks a lot. Happy to hear that! I had a feeling the machine will be smarter than that.
It can depend on the design of the level control board. On the first one I did the level probe on one input of the comparator has a higher impedance than the voltage divider on the other, so parasitic capacitances cause a small RC time constant to delay the input which means the pump starts whenever the machine is turned on. The pump stays on for a few seconds due to the time delay on the comparator output (to prevent nuisance switching).
On the new one I have put a small capacitor across the voltage divider so it shouldn't do this (haven't built it up yet so I can't confirm).
Never experienced this behaviour personally...
Only time the pump ran on start-up was when the machine was previously used to deliver Steam/Hot Water.
If the pump runs at every switch-on, then the scenario you paint makes sense.