Grant Boiler Error Codes

Grant Boiler Error Codes

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

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