Heatrae Sadia Aquatap Installation & User's Instructions page 23

SYMPTOM
S t e a m f r o m v e n t p i p e a n d
p r i m a r y c u t - o u t o p e r a t e s
W a t e r c o n s i s t e n t l y c o o l e r
t h a n w h e n n e w
13.0 FAULT FINDING - AQUATAP DISPENSER
SYMPTOM
I n d i c a t o r l i g h t s o n h e a t e r ,
b u t n o t o n d i s p e n s e r
N o w a t e r o w w h e n
d i s p e n s e r b u t t o n p r e s s e d
POSSIBLE CAUSE
1. Control thermistor fault -
open circuit
2. Electronic control PCB fault
3. Scale build up
1. Control thermistor pocket has a
covering of scale
2. Control thermistor out of
calibration
3. Steam thermistor out of
calibration
4. Water was drawn o during
commissioning mode
POSSIBLE CAUSE
1. Dispensing tap control cable
not connected to heater
2. Dispensing tap PCB fault
1. Solenoid valve fault
2. Pump not operating
3. Dispensing tap PCB fault
4. Control box PCB fault
ACTION
1. Check continuity
2. Check all connections to the control PCB,
replace if necessary
3. Descale unit
1. Descale unit, clean pocket surface
2. Check thermistor values (5k at 100 °C,
100k at 25 °C)
3. Check thermistor values (5k at 100 °C,
100k at 25 °C)
4. Recommission heater
ACTION
1. Check that dispensing tap control cable is
connected to heater
2. If tap control is correctly connected, check
and if necessary replace dispensing tap PCB
1. Check solenoid operation, replace if necessary
2. Check supply to pump. If necessary replace
pump
3. Check tap control cable
4. Check all connections to control box PCB
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