Modine Manufacturing MPR - Table 54.1 - Furnace Master Control Board (VB1200) Error Codes

54 MCP15-500.7
Display
Code
Description Additional comments and notes
888 Board Failure (Up to 10 sec @ power up)
Verify 24 VAC signal input at connector J6.
Off UP Mode: Burner state = Off
Normal Operation
Pur UP Mode: Burner state = Purge
Ign UP Mode: Burner state = Ignition
HEA UP Mode: Burner state = Warmup
Run UP Mode: Burner state = Run
rEt UP Mode: Burner state = Retry (with A01 or A02)
Retrydelayfollowingeitherafailedignitionoraameloss.
A01 Failed ignition attempt
A02 Lost Flame
Ignitionwassuccessfulbutthenamedisappeared.
A03 InsufcientCombustionAir
Blocked vent with actuator position de-rated by >20% from FRI setting.
A04
Limited Low Fire
(due to Lost Flame Auto-Adaptation)
Flamelossatlowreresultsinanauto-adjustmentlimitoftheburnerturndown
by adjusting the minimum modulation voltage during the rest of the current
cycle or until a CPU reset.
A05 Weak Flame Signal
Flamepresencesignaloflessthan1.5μAindicatesanagedamerod.
A06
No Low Fire Mode
(due to Hi Gas Pressure at Low Fire)
TheGasPressureisnotmodulatingdowntolowre.
A07 Loss of Inducer Motor Control
The Air Pressure is not modulating down at minimum inducer drive.
A08 Air Sensor Null Pressure Check out-of-tolerance
The Air Pressure sensor zero reading appears to be out-of-tolerance.
A99 COM Error – Slaves
CRC errors, serial bus loaded down or possibly poor cable/routing.
E01 Failed Ignition
Four failed ignition attempts have occurred.
E02 Primary Limit Failure
Verify Primary Limit input at connector J8 and fuse at F1.
E03 Modulation Valve Failure
The Valve Actuator did not reach a Park or Full On position.
E04 Air Sensor Failure - Pressure Reading Low
Includes air switch failure to open during pre-purge switch check, includes
insufcientairlockoutduetoblockedvent.
E05 Air Sensor Failure - Pressure Reading High
Includes air switch failure to close during pre-purge switch check.
E06
Gas Sensor Failure - Pressure Reading Low
(Possible modulating valve actuator misalignment)
Verify Gas Pressure Sensor signal input at connector J13.
E07
Gas Sensor Failure - Pressure Reading High
(Possible modulating valve actuator misalignment)
SignicantGasPressure detected during the Off burner state.
E08 Improper Flame
E09 No Firing Rate Input
The thermostat “W” input is calling for heat but the FRI is < 2.0 V.
A20 Slave Furnace A COM Missing
Loss of a previously established serial communication link.
A21 Slave Furnace A Lockout
Refer to VB1201 slave board diagnostics table.
A30 Slave Furnace B COM Missing
Loss of a previously established serial communication link.
A31 Slave Furnace B Lockout
Refer to VB1201 slave board diagnostics table.
A40 Slave Furnace C COM Missing
Loss of a previously established serial communication link.
A41 Slave Furnace C Lockout
Refer to VB1201 slave board diagnostics table.
Eid Invalid I.D. Plug Installed
Table 54.1 - Furnace Master Control Board (VB1200) Error Codes
(Applies to B-, C-, and D-Cabinet Units with Gas Heat Option furnace model number Digit 11=6 or 8) j
SERVICE & TROUBLESHOOTING - CONTINUED
j To clear furnace control board error codes, refer to the section “Clearing Furnace Control Board Error Codes” on page 23.