You're lucky I check you should have put this question in the caravans section you would have received replies maybe from someone who had and solved the same problem.
I have Lunar tourer manual pump thetford toilet C4 sticking with it as fed up with other c/van elec pumps and switched going on the blink. Got to sort taps out another switch pain in the arse fault.
HOPE THE FOLLOWING HELPS.
Bench types: C2 has it's own pump
Bench types: C3 has electronic valve and works from the main water tank/barrel but these are usally fitted to motorhomes.
In either case is sounds like the micro switch is stuck in the 'On' position. See below for access to thetford website and their pdf free repair downloads. If you don't know what model you have search the products page listing 'Built ins'
SEE TIP BELOW.
UK www.thetford-europe.com
Australia www.thetford.com.au (Even get request from Australian campers)
Australia site has stockist list.
HOME PAGE SELECT ENGLISH {if in Australia forget this selection)
NEXT PAGE SELECT CUSTOMER SERVICE (top line)
NEXT PAGE SELECT USER INFORMATION (left of pic) also 'Ask thetford' is on this page.
NEXT PAGE SELECT REPAIR INSTRUCTIONS (left of pic)
NEXT PAGE SELECT BUILT IN TOILETS [top right of pic]
NEXT PAGE SELECT This is where you select your toilet range. Search alll if unsure of type/range
NEXT PAGE PDF Files You should be in the pdf folder list on your Thetford toilet. Start downloading.
TIP: C2
Never try replacing the pump cable back to micro switch unit [unless you have to] you'll have to take the whole unit out to do that. Just cut the old wire and splice to the new pump wire using heat shrink sleaves obtainable in some auto shops. Watch the wire with thin trace colour [eg: white with black thin tracer colour] no matter if the wires are different colour make sure that you joint the wires with tracer colour on the old pump wire to the wire with a tracer on the new pump,then obviously join the two plain ones together.
