Modine Manufacturing MPR30 - Primary Furnace Control Board Error Codes Table

60 MCP15-500.9
Display
Code
Description Additional comments and notes
888
Board Failure (Up to 10 sec @ power up) Verify 24 VAC signal input at connector J6.
O󰀨
UP Mode: Burner state = O󰀨
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 Insu󰀩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 – Secondary Furnace(s) 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
insu󰀩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 O󰀨 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 Secondary Furnace A COM Missing Loss of a previously established serial communication link.
A21 Secondary Furnace A Lockout Refer to VB1201 secondary board diagnostics table.
A30 Secondary Furnace B COM Missing Loss of a previously established serial communication link.
A31 Secondary Furnace B Lockout Refer to VB1201 secondary board diagnostics table.
A40 Secondary Furnace C COM Missing Loss of a previously established serial communication link.
A41 Secondary Furnace C Lockout Refer to VB1201 secondary board diagnostics table.
Eid Invalid I.D. Plug Installed
Table 60.1 - Primary Furnace 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 25.