Modine Manufacturing MPR Series Installation And Service Manual page 60

SERVICE & TROUBLESHOOTING - CONTINUED
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
Display
Code
888 Board Failure (Up to 10 sec @ power up)
Off UP Mode: Burner state = Off
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)
A01 Failed ignition attempt
A02 Lost Flame
A03 Insufficient Combustion Air
Limited Low Fire
A04
(due to Lost Flame Auto-Adaptation)
A05 Weak Flame Signal
No Low Fire Mode
A06
(due to Hi Gas Pressure at Low Fire)
A07 Loss of Inducer Motor Control
A08 Air Sensor Null Pressure Check out-of-tolerance
A99 COM Error – Secondary Furnace(s)
E01 Failed Ignition
E02 Primary Limit Failure
E03 Modulation Valve Failure
E04 Air Sensor Failure - Pressure Reading Low
E05 Air Sensor Failure - Pressure Reading High
Gas Sensor Failure - Pressure Reading Low
E06
(Possible modulating valve actuator misalignment)
Gas Sensor Failure - Pressure Reading High
E07
(Possible modulating valve actuator misalignment)
E08 Improper Flame
E09 No Firing Rate Input
A20 Secondary Furnace A COM Missing
A21 Secondary Furnace A Lockout
A30 Secondary Furnace B COM Missing
A31 Secondary Furnace B Lockout
A40 Secondary Furnace C COM Missing
A41 Secondary Furnace C Lockout
Eid Invalid I.D. Plug Installed
To clear furnace control board error codes, refer to the section "Clearing Furnace Control Board Error Codes" on page 25.
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60
Description Additional comments and notes
Verify 24 VAC signal input at connector J6.
Normal Operation
Retry delay following either a failed ignition or a flame loss.
Ignition was successful but then flame disappeared.
Blocked vent with actuator position de-rated by >20% from FRI setting.
Flame loss at low fire 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.
Flame presence signal of less than 1.5μA indicates an aged flame rod.
The Gas Pressure is not modulating down to low fire.
The Air Pressure is not modulating down at minimum inducer drive.
The Air Pressure sensor zero reading appears to be out-of-tolerance.
CRC errors, serial bus loaded down or possibly poor cable/routing.
Four failed ignition attempts have occurred.
Verify Primary Limit input at connector J8 and fuse at F1.
The Valve Actuator did not reach a Park or Full On position.
Includes air switch failure to open during pre-purge switch check, includes
insufficient air lockout due to blocked vent.
Includes air switch failure to close during pre-purge switch check.
Verify Gas Pressure Sensor signal input at connector J13.
Significant Gas Pressure detected during the Off burner state.
The thermostat "W" input is calling for heat but the FRI is < 2.0 V.
Loss of a previously established serial communication link.
Refer to VB1201 secondary board diagnostics table.
Loss of a previously established serial communication link.
Refer to VB1201 secondary board diagnostics table.
Loss of a previously established serial communication link.
Refer to VB1201 secondary board diagnostics table.
MCP15-500.9