Technical data
Procon
. LMU C, F I
If the boiler fails to operate correctly the unit will ‘Lockout’ and require manual intervention to reset the
controller. On the LCD display will appear in the bottom ‘Left-Hand’ corner, and a LARGE ERROR code will
be displayed.
If more than one error has occurred, these can be displayed by pressing the ‘INFO’ button. These error mes-
sages can be referenced against the table below. To reset the boiler, simply press the ‘RESET’ button.
Please Note;
• Prior to pressing the RESET Button, please make a note of this number as it will assist a member
of the Technical Services Department within the RVR Group to diagnose the fault, and if required,
adviseon a remedial action required.
• Pressing the RESET Button when a LARGE ERROR code IS NOT displayed will induce an E fault.
Fault
Code
See
Notes
Description
Fault
Code
See
Notes
Description
E- No Error Detected E- * Boiler Temperature Currently Too High
E- * Outside Air Sensor Fault / Not Detected E- * Flue Gas Temperature Currently Too High
E- * Flow Water Sensor Fault / Not Detected E- Fault with Burner
E- * Flue Gas Sensor Fault /Not Detected E- *
External Safety Interlock Activated (X is
currently Open Circuit)
E- * Return Water Sensor Fault / Not Detected E- * * No Flame Detected After Last Ignition Attempt
E- * System Return Water Sensor Fault / Not Detected E- * * Flame Extinguished During Operation
E- * *
HWS Sensor Short Circuit
{Check parameter if Volt Free Enable is being used}
E Air Supply Error (Not Used)
E- * HWS Sensor Short Circuit (Not Used)
E-
*
LPB Address Not Recognized
{When Using OCI Clip & an RVA Controller}
E- * HWS Volt Free Enable Fault Not Detected E- *
LPB Missing Partner
{When Using OCI Clip & an RVA Controller}
E- * Faulty Room Sensor (QAA) E- *
Wrong Device Connected to PPS
{When Using OCI Clip & an RVA Controller}
E- * Incorrect Room Unit Fitted
E-
*
Unrecognized Plant Con guration
{When Using OCI Clip & an RVA Controller}
E- * Incorrect Room Unit Fitted E- *
Burner Modules Not Connected
{When Using OCI Clip & an RVA Controller}
E- Water Pressure Sensor Not Detected (Not Used)
E-
*
LPB Interface Not Con gured
{When Using OCI Clip & an RVA Controller}
E- Water Pressure Sensor Defective (Not Used) E- Non-Speci c Boiler Fault
E- *
LPB Short Circuit
{When Using OCI Clip & an RVA Controller}
E-
LMU Malfunction, Excessive Power Loading via
Pump Connections. LPB Address Con ict
E- *
LPB Adress Con ict
{When Using OCI Clip & an RVA Controller}
E- LMU Parameter Programming Error
E- *
Short Circuit in PPS Connection
{When Using OCI Clip & an RVA Controller}
E-
RESET Button Pressed When Boiler IS NOT in a
fault condition.
E- EEPROM Error. Internal LUM Fault E- * *
LMU Operating Error Detected. Refer to
Section .
E- Hardware Malfunction (Potential PCB Overload)
E-
* Fan Not Reaching Set Point.
E-
* *
Con ict between Time/Day Master Controller
(Boiler/QAA/RVA… etc.)
E- Combustion Fan Speed Too High
E-
Annual Service / Inspection Overdue
{Unit has operated for more than months}
E Air Pressure Switch Fault (Not Used)
E-
Boiler Water Temperature Overheat / Internal
Fuse Blown, X- Wiring Error
E Flow Switch / Pressure Switch Open (Not Used)
E- * Boiler Temperature Currently Too High E Air Pressure switch Fault (Not Used)
E * Flue Gas Temperature Currently Too High
E-
Boiler Operating in Chimney Mode (
Output).
E High System Water Pressure Sensor (Not Used) E-
Boiler Operating in Commissioning Mode
( – )
E- Low System Water Pressure Sensor (Not Used) E-
Boiler Controller / QAA Room Unit in Parameter
Setting Mode.
E *
System Water Pressure Switch Activated
(Low System Pressure)
bu
Communication Error between LMU & Display
Module. Check ribbon cable.
NOTES:
* SMALL Error Codes will automatically reset when the fault has been corrected.
* If a fault re-occurs repeatedly, then the Error Code will convert to a LARGE Error Code requiring a Manual Reset.
* Refer to Parameter Changes, as detailed in Section , System Con gurations.