Peerless
Peerless Boilers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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AF
Boiler displays AF and will not fire; may indicate 'Air Flow Fault'
Combustion Air / Fan Speed Fault
E0
Boiler control display shows E0 and burner will not start
Control Lockout / Internal Control Fault
E1
Boiler shows E1 and will not fire; may attempt ignition and shut down
Ignition Failure / No Flame Detected
E2
Boiler displays E2 and shuts down shortly after firing or during operation
Flame Loss During Run
E3
Boiler shows E3 and will not start; fan may run briefly then stop
Pressure Switch / Air Proving Failure
E4
Boiler displays E4 and shuts down; may occur after long run time
High Limit Temperature Lockout
E5
Boiler shows E5 and will not fire; may occur on cold start
Low Water Pressure / Low Water Cutoff Lockout
E6
Boiler control shows E6 and shuts down; may be intermittent
Supply Temperature Sensor Fault
E7
Boiler displays E7 and may run at reduced output or lock out
Return Temperature Sensor Fault
E8
Boiler shows E8 and shuts down shortly after starting the fan
Flue Gas Temperature Sensor Fault / Overheat
E9
Boiler control shows E9 and will not respond to thermostat calls
Communication Error / Internal Control Failure
F0
Boiler shows F0 fault and locks out; may be labeled 'Flame Signal Error'
Weak or Unstable Flame Signal
F1
Boiler displays F1 and will not start; fan may not run
Fan / Inducer Failure
F2
Boiler shows F2 and shuts down; may be labeled 'Flame Detected with No Call'
False Flame Detection
F3
Boiler displays F3 and locks out; may occur during venting issues
Blocked Flue / Vent Safety Lockout
F4
Boiler shows F4 and will not fire; may be labeled 'Gas Valve Error'
Gas Valve Circuit Fault
F5
Boiler displays F5 and may cycle frequently without heating properly
Outdoor Sensor Fault (if equipped)
F6
Boiler shows F6 and locks out; may be labeled 'Low Voltage' or 'Line Error'
Line Voltage / Power Supply Fault
F7
Boiler control shows F7 and may indicate 'Pump Error'
Circulator Pump Fault
F8
Boiler displays F8 and may indicate 'Condensate Fault'
Condensate Drain Blocked
F9
Boiler shows F9 and may indicate 'Limit String Open'
Safety Limit Circuit Open
H1
Boiler display shows H1 and unit runs at reduced capacity
High Supply Temperature Warning (Not Full Lockout)
H2
Boiler shows H2 and may shut down intermittently during long runs
Return Temperature Too High / Delta-T Too Low
HP
Boiler shows HP and may discharge water from relief valve
High System Pressure
LP
Boiler display shows LP and shuts down; may be labeled 'Low Pressure'
Low System Water Pressure
Symptom
Boiler cabinet or flue area shows signs of soot or black staining
Sooting / Incomplete Combustion
Symptom
Boiler cycles on and off but house does not reach thermostat setpoint
Insufficient Heat Output
Symptom
Boiler display is blank or unreadable but boiler still runs
Display / User Interface Failure
Symptom
Boiler emits a strong gas smell near the burner compartment
Gas Leak at Burner or Gas Train
Symptom
Boiler emits gurgling or trickling water sounds in piping
Air in System / Poor Air Elimination
Symptom
Boiler flue pipe shows white residue or corrosion at joints
Condensate Leakage / Improper Venting
Symptom
Boiler frequently locks out and must be manually reset
Repeated Safety Lockouts
Symptom
Boiler ignites with a loud pop or bang
Delayed Ignition
Symptom
Boiler leaks water from the pressure relief valve discharge pipe
Relief Valve Discharge / Overpressure
Symptom
Boiler makes loud banging or knocking noises when starting or stopping
Water Hammer / Thermal Expansion Noise
Symptom
Boiler or nearby piping emits a whistling or high-pitched noise during firing
Flow Restriction / Partially Closed Valve
Symptom
Boiler produces rumbling or roaring noise during operation
Combustion Instability / Delayed Ignition
Symptom
Boiler room feels unusually hot; boiler jacket is very warm to the touch
Excessive Standby Loss / Insulation or Draft Hood Issue
Symptom
Boiler runs but radiators or baseboards stay cold
No Circulation / Air-Bound System
Symptom
Boiler runs continuously and overshoots thermostat setting
Boiler Will Not Shut Off / Control Fault
Symptom
Boiler short cycles: starts and stops frequently with small temperature changes
Short Cycling / Oversized Boiler or Control Misconfiguration
Symptom
Boiler will not start at all; no lights or display on Peerless control
No Power to Boiler
Symptom
Water is found under or around the Peerless boiler cabinet
General Boiler Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| AF |
Boiler displays AF and will not fire; may indicate 'Air Flow Fault'
|
Combustion Air / Fan Speed Fault | View Details |
| E0 |
Boiler control display shows E0 and burner will not start
|
Control Lockout / Internal Control Fault | View Details |
| E1 |
Boiler shows E1 and will not fire; may attempt ignition and shut down
|
Ignition Failure / No Flame Detected | View Details |
| E2 |
Boiler displays E2 and shuts down shortly after firing or during operation
|
Flame Loss During Run | View Details |
| E3 |
Boiler shows E3 and will not start; fan may run briefly then stop
|
Pressure Switch / Air Proving Failure | View Details |
| E4 |
Boiler displays E4 and shuts down; may occur after long run time
|
High Limit Temperature Lockout | View Details |
| E5 |
Boiler shows E5 and will not fire; may occur on cold start
|
Low Water Pressure / Low Water Cutoff Lockout | View Details |
| E6 |
Boiler control shows E6 and shuts down; may be intermittent
|
Supply Temperature Sensor Fault | View Details |
| E7 |
Boiler displays E7 and may run at reduced output or lock out
|
Return Temperature Sensor Fault | View Details |
| E8 |
Boiler shows E8 and shuts down shortly after starting the fan
|
Flue Gas Temperature Sensor Fault / Overheat | View Details |
| E9 |
Boiler control shows E9 and will not respond to thermostat calls
|
Communication Error / Internal Control Failure | View Details |
| F0 |
Boiler shows F0 fault and locks out; may be labeled 'Flame Signal Error'
|
Weak or Unstable Flame Signal | View Details |
| F1 |
Boiler displays F1 and will not start; fan may not run
|
Fan / Inducer Failure | View Details |
| F2 |
Boiler shows F2 and shuts down; may be labeled 'Flame Detected with No Call'
|
False Flame Detection | View Details |
| F3 |
Boiler displays F3 and locks out; may occur during venting issues
|
Blocked Flue / Vent Safety Lockout | View Details |
| F4 |
Boiler shows F4 and will not fire; may be labeled 'Gas Valve Error'
|
Gas Valve Circuit Fault | View Details |
| F5 |
Boiler displays F5 and may cycle frequently without heating properly
|
Outdoor Sensor Fault (if equipped) | View Details |
| F6 |
Boiler shows F6 and locks out; may be labeled 'Low Voltage' or 'Line Error'
|
Line Voltage / Power Supply Fault | View Details |
| F7 |
Boiler control shows F7 and may indicate 'Pump Error'
|
Circulator Pump Fault | View Details |
| F8 |
Boiler displays F8 and may indicate 'Condensate Fault'
|
Condensate Drain Blocked | View Details |
| F9 |
Boiler shows F9 and may indicate 'Limit String Open'
|
Safety Limit Circuit Open | View Details |
| H1 |
Boiler display shows H1 and unit runs at reduced capacity
|
High Supply Temperature Warning (Not Full Lockout) | View Details |
| H2 |
Boiler shows H2 and may shut down intermittently during long runs
|
Return Temperature Too High / Delta-T Too Low | View Details |
| HP |
Boiler shows HP and may discharge water from relief valve
|
High System Pressure | View Details |
| LP |
Boiler display shows LP and shuts down; may be labeled 'Low Pressure'
|
Low System Water Pressure | View Details |
| – |
Boiler cabinet or flue area shows signs of soot or black staining
|
Sooting / Incomplete Combustion | View Details |
| – |
Boiler cycles on and off but house does not reach thermostat setpoint
|
Insufficient Heat Output | View Details |
| – |
Boiler display is blank or unreadable but boiler still runs
|
Display / User Interface Failure | View Details |
| – |
Boiler emits a strong gas smell near the burner compartment
|
Gas Leak at Burner or Gas Train | View Details |
| – |
Boiler emits gurgling or trickling water sounds in piping
|
Air in System / Poor Air Elimination | View Details |
| – |
Boiler flue pipe shows white residue or corrosion at joints
|
Condensate Leakage / Improper Venting | View Details |
| – |
Boiler frequently locks out and must be manually reset
|
Repeated Safety Lockouts | View Details |
| – |
Boiler ignites with a loud pop or bang
|
Delayed Ignition | View Details |
| – |
Boiler leaks water from the pressure relief valve discharge pipe
|
Relief Valve Discharge / Overpressure | View Details |
| – |
Boiler makes loud banging or knocking noises when starting or stopping
|
Water Hammer / Thermal Expansion Noise | View Details |
| – |
Boiler or nearby piping emits a whistling or high-pitched noise during firing
|
Flow Restriction / Partially Closed Valve | View Details |
| – |
Boiler produces rumbling or roaring noise during operation
|
Combustion Instability / Delayed Ignition | View Details |
| – |
Boiler room feels unusually hot; boiler jacket is very warm to the touch
|
Excessive Standby Loss / Insulation or Draft Hood Issue | View Details |
| – |
Boiler runs but radiators or baseboards stay cold
|
No Circulation / Air-Bound System | View Details |
| – |
Boiler runs continuously and overshoots thermostat setting
|
Boiler Will Not Shut Off / Control Fault | View Details |
| – |
Boiler short cycles: starts and stops frequently with small temperature changes
|
Short Cycling / Oversized Boiler or Control Misconfiguration | View Details |
| – |
Boiler will not start at all; no lights or display on Peerless control
|
No Power to Boiler | View Details |
| – |
Water is found under or around the Peerless boiler cabinet
|
General Boiler Leak | View Details |
No matching codes found
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