Boiler Parameter Worksheet
Appendix
40
The ENVI
®
boiler control will display text based error descriptions to indicate any problems with the boiler. There are
two types of lockouts the control may experience: manual reset lockouts requiring an operator to press the reset
button, and automatic reset lockouts that will self-reset when the error condition clears. Below is a comprehensive list
of the locking and blocking error codes
2.0.1.1
Auto-reset Error Codes
– E## (Blocking Errors)
Code ENVI
®
Control Display
Lockout Description
E01
T FLOW OPEN
53
Flow sensor not connected
E02
T RETURN OPEN
54
Return sensor not connected
E03
T FLUE OPEN
59
Flue sensor not connected
E04
T DHW OPEN
57
DHW sensor not connected
E05
T HX OPEN
58
Heat exchanger sensor not connected
E06
HEADER SENSOR OPEN
70
Header sensor on IF board not connected
E11
T FLOW SHORTED
61
Flow sensor shorted
E12
T RETURN SHORTED
62
Return sensor shorted
E13
T FLUE SHORTED
67
Flue sensor shorted
E14
T DHW SHORTED
65
DHW sensor shorted
E15
T HX SHORTED
66
Heat exchanger sensor shorted
E16
HEADER SENSOR SHORTED
71
Header sensor on IF board shorted
E18
PHASE ERROR
46
Phase and neutral of supply voltage mains are reversed
E19
E2PROM READ ERROR
0
Problems from reading from or writing to E2prom
E20
FLAME ERROR 2
74
False flame detected
E21
LOW FLOW/ILK
73
Low flow or interlock error
E22
WD 50HZ ERROR
45
No earth ground connected or internal hardware error
E23
NET FREQ ERROR
47
Main supply voltage frequency differs more than 2% from
60HZ
E24
FAULTY EARTH ERROR
48
Faulty earth ground to boiler
E30
FLUE GAS ERROR
39
Flue gas sensor is above setpoint plus differential
E32
RETURN TEMP ERROR
42
Return temperature is above 90 degrees
E34
BLOCKED FLUE ERROR
41
Flue gas outlet is restricted or blocked
E41
REVERSE FLOW ERROR
43
Supply and return temp are reversed
E42
WD COMMUNICATION ERROR
49
Internal hardware error
E44
FLAME CKT FAULT
40
Ionization or flame rod wire is lost
E45
REFHI TOO LO ERROR
35
Internal hardware error
E46
REFHI TOO HI ERROR
36
Internal hardware error
E47
REFLO TOO LO ERROR
37
Internal hardware error
E48
REFLO TOO HI ERROR
38
Internal hardware error
E 49
RAPID RISE HX ERROR BLOCK
51
Heat exchanger temperature rise to rapidly (blocking)
E50
RAPID RISE ERROR BLOCK
72
Flow temperature rise too rapidly (blocking)
E51
RESET BUTTON ERROR
68
Reset button pressed more than 7 times within 1 minute
E52
APPLIANCE SELECTION ERROR
50
Appliance and resistor do not match at start up
E54
IF COMMUNICATION FAILURE
69
No communication with interface board
