Sime FRIENDLY User Manual

19
6.7 D.H.W. MODE - FAULT FINDING (“FRIENDLY” model)
Start from cold - Summer / Winter switch set to SUMMER position, D.H.W. thermostat set to maximum, and all D.H.W.
taps OFF.
Open any D.H.W. tap
to give flow 2.8 l/min.
Can you get desired
flow at the tap?
Clean or
replace filter
at inlet of
divertor valve
Are
microswitches of divertor
valve
operated?
Replace
divertor valve
NO
YES NO
Replace
D.H.W.
thermistor
Is there 230 V
supply to fan?
Is pump
shaft free
to rotate?
Has pressure
switch operated?
Is limit thermostat
calling for heat?
Remove connector J1 from PCB.
Does fan change to high?
Is pump
running?
Is there
power supply
to pump?
Is PCB
fuse OK?
Replace
pump
Free it
Replace PCB
Replace
fuse
Does fan
change
speed?
Replace
fan
Replace
smoke
pressure
switch
Check sensing pipe connections
and pipes for blockage.
Does it operate?
Replace
pressure
switch
YES
YES
YES YES
YES
YES
YESNO
YES YES
YES YES YES
YES NONO
YES
NO
NO
NO NO
NO
NO
NO
NO
NO NO NO
NO NO YES YES
NO
Does main
burner light
from pilot?
Is main
burner
pressure
achieved?
Can burner pressure be
reduced via D.H.W. adjuster?
Does burner pressure reduce as
temperature rises towards max.?
Replace main
coil. Does
main burner
crosslight?
Is there
electrical
current at
modul. coil?
Replace
D.H.W.
termistor
Is there cur-
rent variation
on the modu-
lating coil?
Does boiler
switch OFF
before temp.
attainment?
Verify: 1. Limit
stat 2. C.H.
thermistor
3.PCB
Replace gas
valve
Check
the gas valve
pressure
regulator
Replace
the gas valve
coil
Boiler
satisfactory
YES
NO
YES

Sime FRIENDLY Specifications

General

Brand	Sime
Model	FRIENDLY
Category	Boiler
Language	English