13
Appliance Control Display
10, 11, 12,
1, 28
4
0
2
29,30
5
6
8
13, 14
sensor fault S1
- CH supply
• Check wiring for break
• Check for proper flow direction
• Replace S1
• E10 Open sensor
• E 11 Shorted sensor
• E12 Decreased too quickly
• E13 Increased too quickly
• E14 Stuck
• Replace S2
• E 20 Open sensor
• E 21 Shorted sensor
• E22 Decreased too quickly
• E23 Increased too quickly
• E24 Stuck
20, 21, 22,
23, 24
- CH return
sensor fault S2
• Check wiring for break
• Check for proper flow direction
- Sensor fault after self check • Replace S1 and/or S2
- Temperature too high
• Air in installation
• Pump not running
• Insufficient flow in installation, shut off valves closed, pump setting too low
• CHeck for wiring
- CH supply sensor S1 and CH
return sensor S2
interchanged
• Check for proper flow direction
• Replace S1 or S2
- No flame signal
• Manual gas shut off valve closed
• Remove air from gas pipe
• Gas supply pressure too low or failing
• Gas valve or ignition unit not powered
• Incorrect ignition gap
• Check adjustment of gas valve
- Poor flame signal
• Condensate drain blocked
• Check adjustment of gas valve
- Flame detection fault
• Replace ignition cable + spark plug cap
• Replace ignition unit at gas valve
• Replace boiler controller
- Incorrect fan speed
• Fan catching on casing
• Wiring between fan and casing
• Check wiring for poor wire contact
• Replace fan
- Gas valve relay fault
• Replace boiler controller
* Red
LED above
button will flash, correct condition, and press
button.
Operating
Display
(Flashing)
Main Display
Possible Solution
Error Description
E
18, 19
fault
- Flue sensor
• E18 open sensor
• E19 Shorted sensor
• Check/Replace sensor
E
50F
- Improper frequency
• Verify ground
• Frequency should be between 45 and 65 Hz
E
E
E
E
E
E
E
E
E
If outdoor sensosr is shorted the boiler will not enter into a hard lockout but will maintain the minimum supply temperature
of the heat curve.
NOTICE
Error (Hard Lockout) Codes*
