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751262 MANUAL
19/10/10
08:41
Page 8
3.0
BOILER OPERATION
3.1
CENTRAL HEATING
1. With a demand for heating, the pump, circulates water
through the primary circuit.
2. Once the main burner ignites the fan speed controls the gas
rate to maintain the heating temperature measured by the
temperature sensors.
3. When the demand is satisfied the burner is extinguished and
a 5 minute delay occurs before the burner will re-light (anti-
cycling), the pump continues to run for a period of 2 minutes
(Pump Overrun).
3.2
FROST PROTECTION MODE
1. Providing there is mains power supply to the appliance, the frost
protection mode is integral.
If the system temperature falls below 5°C then the boiler will fire on
its minimum setting until a flow temperature of 20°C is reached.
Further protection can be incorporated by using a system frost
thermostat.
3.3
PUMP PROTECTION
1. The pump will automatically operate for 1 minute in every 24 hours
to prevent sticking.
8
Manual
Bleed Valve
Flue Products
Expansion
Vessel
Burner &
CH flow
Burner Flange
Thermistor
CH return
Thermistor
Primary Return
CH
Flow
Automatic
Air
Pump &
Vent
Hydroblock
3 BAR
Pressure Relief
Valve
Pressure
Gauge
CH
Return
© Dimplex Boilers 2008
16.0
ERROR CODES
ERROR CODE
DESCRIPTION
1
Overheated
appliance
4
No flame
5
Flame loss
6
Temporarily
overheated appliance
Fig. 3
7
Overheated appliance
11
Flame simulation
12
No ignition
13
No flame
Primary
Heat Exchanger
16
No ignition
20
No flame
24
Faulty fan signal,
no flame and fan
runs continuously
32
No flame
34
CRC Error / No flame
35
BCC Error / No flame
36
BCC Error / No flame
37
BCC Error / No flame
38
BCC Error / No flame
Condensate
Trap
39
BCC Error / No flame
41
Water flow failure/
Flame for a short
period only
42
Water flow failure/
Flame for a short
period only
50
BCC Error / No flame
(No display)
No light indication
The boiler is in an ERROR state when there is an error code flashing on the back lit display.
CH = Ce e ntral Heating
BCC = Boiler Chip Card
Press and release the RESET button, the control tries to in n itiate a restart if possible
REASON
ACTION
CH Water temperature
•Check no air is in heat exchanger/CH system
greater than 105°C
•Check plate heat exchanger for blockages
•Check CH thermistor
•Check system bypass is functional
No flame signal on ignition
•Check detection electrode/lead – electrode may require cleaning
•Check spark gap
•Check gas supply & pressure
•Check flue system is connected properly
•Check condensate trap not blocked
•Check gas valve and/or lead
Loss of flame signal
•Check detection electrode/lead
during operation
•Check gas valve mains lead
Water temperature
•Check overheat thermostat
greater than 95°C
•Check no air is in heat exchanger/CH system
•CH system and hot water plate heat exchanger blockage
•Check CH thermistor
•Check system bypass is functional
Flue over temperature
•Check no air in heat exchanger
> 92°C
•Check flue thermistor
•Check flue system
•Check pump
•Check PCB/X8 connector
Flame detected when
•Check detection electrode/lead electrode may require cleaning
gas valve closed
•Check gas valve operation.
CH Flow thermistor failure
•Check CH flow thermistor – open circuit
•Check PCB/X6 connector – open circuit
Flue thermistor failure
•Check PCB/X8 connector
•Check flue thermistor
•Check thermal fuse – open circuit
CH Return thermistor failure
•Check CH return thermistor – open circuit
•Check PCB/X6 connector – open circuit
Gas valve V1-V2 failure
•Check/replace gas valve
•Check gas valve harness
•Check PCB/X2A
Missing or defective
•Check fan operation
signal from fan.
•Check fan connection
•Check PCB/X3 connector
•Check flue condition
Power supply failure
•Check mains supply voltage to boiler
•Check all PCB connectors
Incorrect BCC
•Replace correct BCC
(BCC's only fitted to replacement PCB's)
Incorrect/missing BCC
•Reseat or replace BCC
(BCC's only fitted to replacement PCB's)
Damaged BCC
•Replace BCC
(BCC's only fitted to replacement PCB's)
Different BCC
•BCC and PCB software incompatible, replace BCC
(BCC's only fitted to replacement PCB's)
Different BCC
•Reset the appliance in accordance with BCC fitting instructions
(BCC's only fitted to replacement PCB's)
BCC installation failed
•Refit BCC in accordance with BCC fitting instructions
(BCC's only fitted to replacement PCB's)
Low water pressure
•Check CH flow circulation
Reversed sensors
•Check water pressure(> 0.5 bar)
•Check pump/lead
•Check expansion vessel
•Check flow and return sensors connected correct way around
Low water pressure
•Check no air in heat exchanger
No flow
•Check CH flow circulation
Dry run protection
•Check water pressure(> 0.5 bar)
•Check pump/lead
•Check expansion vessel
BCC Activation
•Press reset to activate BCC (BCC's only fitted to replacement PCB's)
Defective power supply
•Check power supply
•Check PCB/X1B connector
•Check PCB fuse
RESET POSSIBLE
Y
Y
Y
Auto Re-start after 1 minute
Y
Y
Auto Re-start when fixed
Auto Re-start when fixed
Auto Re-start when fixed
Y
Y
Auto Re-start when fixed
Auto Re-start when fixed
Auto Re-start when fixed
Auto Re-start when fixed
Auto Re-start when fixed
Auto Re-start when fixed
Auto Re-start when fixed
Y
Y
Y
Auto Re-start when fixed
41
© Dimplex Boilers 2008
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