Fisher & Paykel DishDrawer DD24D Series Service Manual page 42

599735A
Customers Complaint - Glasses & cutlery have a cloudy white film
on them and/or plates have a white chalky film on them
C1 Water Softener Diverter Valve
In hardware output diagnostics test mode:
FU – turn the fill water valve on
P2 – turn the motor drain on
C1 – water softener diverter valve
On – water bypasses the resin tank
Off – water flows through the resin tank
C2 Water Softener Brine Pump
Turn the brine pump on in diagnostics mode. Observe a small
quantity of water (approximately 30 ml per min.) flowing out the
bottom of the dispenser (drop the dispenser door down to observe
this.) Observe a change in the water level (approximately 120ml
per 4 min.) in the salt reservoir. The reservoir should pump dry of
water in this time.
Note: - Fill the salt reservoir with salt (and then water if not already)
before performing this test.
Pipe Interrupter (Air Break) Function
A critical component in the performance of the water softener is the
pipe interrupter air break (PI). There is a certain amount of spray
leakage from the PI, which is used to provide water to the salt
reservoir.
If the spray is inadequate, there will be insufficient water in the salt
reservoir to make brine.
If there is too much spray, then the excess bypasses the water
softener and defeats the softening process by pouring untreated
water straight into the tub.
To check that the amount of spray is appropriate:-
Fill the salt reservoir with water.
• In diagnostics mode, turn on the fill water valve and the motor
drain. Water will flow out of the dispenser into the tub, as well
as out of the water softener overflow into the tub.
• Observe the flow from the water softener overflow (beside the
dispenser). There should be a trickle (25-100 ml per minute).
With experience you can guess what is appropriate. If the
trickle is outside these rates, replace the water softener, as the
PI is faulty.
To check that there is water in the salt reservoir, remove the drawer
front and observe the level of water in the tank. (A quick way to
check that there is water in the salt reservoir is to remove the salt
bung and test the water level by placing your finger down through
the opening.)
Detergent or Rinse Aid in the Water Softener
If detergent or rinse aid is poured in to the salt reservoir it will
destroy the water softener. This could also happen if the salt bung
is left off or falls out.
through the resin.
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Evidence of this could be white streaks