Grant Vortex Series User Manual

B NO HOT WATER - BUT CENTRAL HEATING OK
First, set the heating switch to OFF
Is the ‘DEMAND’ indicator
lit?
NO
Check programmer is calling for hot water.
If no programmer is tted: check ‘hot water’ switch is set to ‘CONSTANT’.
NO Check ‘heating’ switch is set to ‘TIMED’.
Is the ‘FLOW SWITCH’
indicator lit?
NO
Check hot water tap is open.
Check water ow rate is at least 3 litres/minute.
Cannot achieve 3 litres/
minute
Check the mains stop tap is open fully.
Check the cold water isolation valve in the boiler is open.
Check if the ow restrictor (located in the cold water isolation valve) is clear.
If not, clean restrictor or remove from valve.
NOTE: No ow restrictor is tted to the Combi 36 model.
Is the water pressure OK?
Low water pressure = low
water ow rate.
Check standing water pressure.
2 bar minimum standing pressure required.
Check running (dynamic) pressure.
1 bar minimum dynamic pressure required.
If water pressure is OK.
Check for blockage in plate heat exchanger unit.
NOTE: In hard water areas, scale will be produced that can block the plate heat
exchanger if no anti-scale protection has been installed.
Refer to Section 5 for further details.
Is plate heat exchanger is
OK.
Check ow switch is correctly positioned: the arrow (on ow switch body) must point in
the direction of ow, i.e. toward the front of boiler.
Check switch is free to operate: close cold water isolation valve, remove ow switch from
pipework - manually operate switch paddle to check.
Remove any debris/blockage from the pipework body or switch paddle.
Check for electrical continuity between ow switch terminals when switch is closed.
No continuity - replace ow switch.
No 230V - check connections at PCB.
If still no 230V - replace PCB.
Is the ‘FLOW SWITCH’
indicator lit?
YES
Flow switch is activated.
Continue to the next check.
Is the ‘DHW PUMP’
indicator lit?
NO Continue to next check.
Is the ‘DHW PUMP’
indicator ashing?
YES
Fast or slow ash
First, set boiler ‘ON/OFF’ switch to ‘OFF’.
Wait 5 seconds.
Then set ‘ON/OFF’ switch back to ‘ON’.
If the ‘DHW PUMP’ indicator
continues ashing.
Fast ash
(twice per second):
Indicates a possible fault
with the ‘store’ thermistor.
Check DHW ‘store’ thermistor connection to PCB.
Replace ‘store’ thermistor.
Slow ash
(once every 2 seconds):
Indicates a possible fault
with the PCB (relay).
Replace PCB.
Is the ‘DHW PUMP’
indicator lit?
YES
PCB is supplying voltage to
the DHW pump - but pump
is not working.
Check for electrical connections at the pump.
Check for 230V at the pump terminals.
Check if CH pump is stuck:
• Check for rotation of shaft/impeller.
• If still not operating, replace the DHW pump.
YES
DHW pump is working but
no circulation.
Check both pump valves are open.
Check non-return valve on DHW pump is operational (not sticking).
Check there are no air locks in the system (if removal of air is di󰀩cult - see additional
check list).
YES
DHW pumpis working and
water is circulating.
Hot or warm water should be present at hot tap.
If not: refer to ‘poor hot water’ procedure in Section 12.3.
Is the ‘BURNER’ indicator
lit?
YES
Is burner ring?
If no: refer to ‘burner not operating’ procedure in Section 12.2 (C).
Page 45Section 12: Fault Finding

Grant Vortex Series Specifications

General

Brand	Grant
Model	Vortex Series
Category	Boiler
Language	English