Digital heating contoller problems

[davidf1067]

We had a sunvic timer which our electrian has replaced with a grasslin qe2
our system is pumped central heating and gravity hot water.
the problem is when the switch on the back of the timer is set to "gravity" only the hot water works. With it set to "pumped" only cental heating works.
The system has a 2 prt vavle and thermostats on the water tank and in the living room.


All components were working before fitting the digital timer.

The electrican has been back 4 times and cnnot wire it so both system will run.
He has the wireing diagrams supplied with the unit.

Can anyone suggest a solution?

Thank you for your help
David

 

[Boilerman2]

Incorrectly Wired, sparky will need to re-check his wiring

 

[ollski]

Sounds like a gravity system with a tapstat.

 

[twgas]

May be a C plan, in which case programmer should be set as fully pumped.
Get yourself a decent wireupper.