Grant Boiler Error Codes

Grant Boiler Error Codes

Grant Error Codes
The Grant range of powerful, boilers are normally extremely reliable.

Occasionally some things can go wrong, that’s why we’ve created our handy at-a-glance table of Grant error codes and our guide to Common Grant Boiler Problems.

Should you need professional help with your broken boiler, then simply use one of our enquiry forms and we will connect you with the best heating engineers local to you.


Need a boiler repair?

 

 


Grant Error Codes

Listed below are some error codes that could appear on your Grant boiler.

Fault Code Cause of Problem
No display 12V transformer failure
PP1 Inlet (return) water temperature sensor failure
PP1 Inlet (return) water temperature sensor failure
PP2 Discharge gas sensor failure
PP3 Coil temperature sensor failure
PP4 Return gas sensor failure
PP5 Ambient temperature sensor failure
PP6 Discharge gas overheat protection
PP7 Winter anti-freeze protection in operation
EE1 High pressure – circulating pump failure orcircuit air locked
EE2 Low pressure
EE3 Open circuit between PCB terminals 23-24
EE4 Supply L and N are reversed
EE8 Communication failure
Flashing on and off Defrosting
E01 Internal control fault
sHr HP flow sensor short / HP return sensor short
OPn HP flow sensor open / HP return sensor open
SUP Supply sensor short / Supply sensor open
OUTDR Outdoor sensor short / Outdoor sensor open
C2849 Fault C; Chassis Code
Problem is controller area network wiring bus and modules.
fault two; MFG – Manufacturer Specific
Fault eight; Ignition System Or Misfire
fault four; BBV Sensor Circuit Low Voltage
fault nine; Kick-Down Switch Failed Short
U2453 Fault U: Network Code
Problem is climate control system, lighting, airbags, etc..
fault two; MFG – Manufacturer Specific
fault four; Transmission
fault five; TP Sensor Learn Not Complete
fault three; Transmission Control Module Reprogrammable Memory

Need a boiler repair?

 

 


Grant Boiler Error Description

Listed below are some error descriptions that could appear on your Grant boiler.

Fault Description
Boiler Will Not Start
  • Low pressure cut-out activated
  • No electrical supply to burner
  • Check controls are switched on and calling for heat
  • Boiler thermostat and/or overheat thermostat faulty
Burner lights but goes to lock-out
  • fault with burner
  • No fuel supply
  • Oil tank empty
  • Fire valve closed
  • Fire valve closed.Fuel line filter is blocked
  • Oil supply line is air locked
  • Excessive combustion air
  • Fault with burner
Burner fires but smoke visible from flue or high smoke number
  • Insufficient combustion air supply to burner
  • Incorrect or faulty nozzle fitted
  • Fuel pressure too high
Burner pulsates
  • Insufficient combustion air supply to burner
Burner cycles On and Off
  • Contaminated combustion air (balanced flue)
  • Insufficient oil flow to burner due to restriction in supply line
  • Excessive combustion air
Fumes and puffing on starting
  • Flue is blocked
  • Insufficient flue draught
  • Flue pipe or liner is too large or existing stack is unlined
  • Insufficient combustion air supply to burner
Flame slow to stabilise on starting
  • Insufficient combustion air supply to burner
  • Fuel pressure too low
Oil smells
  • Oil leak in supply line or burner
Combustion fume smells
  • Leak around boiler cleaning door
  • Burner not correctly fitted on mounting flange
  • Burner seal ‘O’ ring damaged or missing.
  • Leakage around flue connection
Overheat thermostat operating
  • Faulty boiler thermostat
  • Thermostat sensor not connected to PCB (Vortex Combi only)
  • Faulty overheat thermostat
No water flowing from hot tap
  • Mains water supply is not connected to cold water inlet of boiler
  • One or more isolating valves, stop cocks, etc. in the pipework are closed
  • The cold water isolating valve in the boiler is closed
  • There is a blockage (or blockages) in the pipework
No hot water operation
  • Hot tap is not connected to hot water outlet of boiler
  • Insufficient flow of water through boiler
  • Boiler cold water and hot water connections reversed
  • Thermostatic mixing valve incorrectly fitted
  • Pump is not operating in hot water mode
  • Diverter valve microswitch(es) faulty
  • Diverter valve microswitches not operated
  • Diverter valve seized
  • Diverter valve diaphragm failed
Low water temperature at tap
  • Flow of water through boiler too high
  • Boiler thermostat incorrectly set
  • Thermostatic mixing valve incorrectly set
  • Faulty boiler thermostat
  • Pump speed setting too low
  • Pump is incorrectly fitted
Hot water for short period only
  • Burner not firing for hot water (after a short time)
  • Burner oil pressure set too low at oil pump
  • Incorrect oil nozzle fitted to burner
No operation on heating
  • Timeswitch either not set, or not in an ‘ON’ period
  • Timeswitch not operating
  • Faulty timeswitch
  • Faulty timeswitch switch contacts
  • Timeswitch OK but not switching boiler on
  • Heating switch set to ‘HOT WATER ONLY’
  • Room thermostat not calling for heat
  • Faulty room thermostat
  • No room thermostat or external timeswitch connected to boiler
Flow temperature low
  • Boiler thermostat is set too low
  • Boiler thermostat faulty
  • Boiler is underfired
  • Combustion setting of burner incorrect
  • Boiler heat exchanger is sooted up

Need a boiler repair?

 

 


Grant Vortex / Eco / Pro Boiler Error Codes

Listed below are some error codes that could appear on your Grant Vortex Boiler House, Vortex Eco Utility, Vortex Eco External, Vortex Pro Kitchen/Utility, or Vortex Pro External Boiler.

Fault Code Cause of Problem
No fuel supply Insure that an adequate supply of fuel is available and that the fuel supply valve is open – check the condition of the fuel filter and clean if necessary, ensure fuel supply is reaching burner and vent pump
No Electricity Supply Ensure electricity supply to the boiler is switched on and that all controls are calling for heat – ensure that the overheat thermostat has not tripped, reset if necessary and check the mains supply
Burner not starting – fuel and electricity supplies present Reset boiler on the burner control box – if it is lit refer to burner fault finding charts
Burner lights but goes to lock out If the flame is unstable check the combustion setting
Visible smoke from flue or high smoke number Insufficient air supply. Check the air damper setting and the condition of the fan check room ventilation, check the nozzle size and type, fuel pressure may be too high, check and adjust
Burner pulses Insufficient air supply – check the air damper setting and the condition of the fan, check room ventilation
Flame slow to stabilise during start up Insufficient air supply – Check the nozzle size and type as fuel pressure may be too low, check and adjust insufficient draught clean boiler heat exchanger and check condition of flue
Water temperature low Undersize nozzle and or low fuel pressure check condition of boiler heat exchanger and clean if necessary. Check the boiler thermostat, check the combustion setting, check the condition of the fuel filter
Boiler operating an overheat thermostat Faulty boiler thermostat – no circulation, check circulating pump, check for air lock
Fumes and puffing during starting Check the condition of the chimney to ensure it is not blocked and is high enough to produce the required draught – check that there is an adequate air supply near the burner fan is not drawing products out of the burner
Oil odours Check all fuel line connections and remake as necessary
Combustion fumes smell Check boiler cleaning cover and seal are correctly fitted, check burner is correctly fitted onto flange, check flue is correctly sealed into flue outlet of boiler, check the condensate pipe and trap are operating correctly

Grant vortex blue Error Codes

Listed below are some error codes that could appear on the Grant Vortex Blue Boiler

Fault Code Cause of Problem
Red blinking light Presence of a false flame signal before heat request
Red blinking light Presence of false flame signal during pre-purging
Red blinking light Presence of false flame signal during post-purging or pre-heating
Red steady on UV sensor defective or dirty oil valve defective fault – ignition transformer badly regulated burner, oil fuel not present
Red blinking light Badly adjusted burner, oil valve defective or dirty UV sensor defective or dirty
Red and orange blinking inverted Error with oil valve internal control circuit that drives the oil valve error
Red green blinking inverted Internal memory error
Orange green blinking inverted Check presence of voltage, check the condition of the fuses, check that safety thermostat is not in lockout
Off Eliminate the extraneous light
Off Check that plugs and sockets are connected properly
Red blinking light Eliminate the extraneous light
Red steady on Clear it / replace it / check the pressure and output of the fuel / check air output change nozzle check the coil od solenoid valve
Green blinking light Set the air according to the instructions of the manual or replace

Grant Vortex Eco Error Codes

Listed below are some error codes that could appear on the Grant Vortex Eco Internal / External Wall hung boiler.

Fault Code Cause of Problem
Motor fails to run No electrical supply to boiler check on/off switch is on – it should be neon lit
Lock-out light not lit Fuse has blown – check reason for failure
Motor fails to run No power to burner motor
Burner lock out

Burner motor capacitor fault check and replace if necessary

Grant Vortex Pro Combi Error Codes

Listed below are some error codes that could appear on your Grant Vortex Pro Internal or External Combi boiler.

Fault Code Cause of Problem
Power supply Check that fused spur for heating system and boiler is switched on – check that the electricity supply has not failed
Heating system controls Check that the timer or programmer is working and set to an on period
Boiler controls Check boiler on/off switch is set to on – check that power indicator on and control panel is lit
Burner Check the burner lockout reset button is lit, if yes press the reset button to start the burner if burner fails call an engineer
Heating system Check the heating system water pressure
power If the boiler is not lit it could be a problem with power supply to the boiler switched off or possibly blown a fuse
DHW pump If flashing this indicates either a store thermistor or PCB fault
Flow If the boiler is not lit when a hot tap is opened this could mean there is a lack of water flow or possible flow switch problem
Demand If not lit this indicates either timer or programmer is not calling for hot water / switch is not set to constant
Burner If flashing this indicates a PCB fault

Need a boiler repair?