75
Table AB: Modbus Control Mode Parameters
Table AC: Modbus Error Table
Code
Description
Code
Description
0
No Error
PIM
Jumpers
VERSA
Errors
27
LWCO (Jumper)
1
EEPROM
28
Water Pressure (Jumper)
2
Outdoor Sensor (S4)
29
Air Pressure (Jumper)
3
Supply Sensor (S3)
30
Gas Pressure (Jumper)
4
Plant Sensor IND Supply (S6)
PIM
Sensors
5
Mix Sensor
31
Boiler Outlet Sensor
6
DHW Sensor (S5)
32
Boiler Inlet Sensor
7
Tank Sensor
33
Vent Sensor
8
Pool Sensor
34
High Limit Sensor
10
No PIM1
PIM
Ignition
11
No PIM2
35
Ignition Failure
12
No PIM3
PIM
Errors
13
No PIM4
36
Vent Hi-Limit
14
Condensate
37
Boiler Hi-Limit
15
Vent Temperature
38
False Flame
16
Auto Hi-Limit
39
OEM ID Card
17
Low Water
40
Internal fault
18
Vent Blocked
41
Delta T Max
19
Low Gas Pressure
42
HSI Proof
20
High Gas Pressure
43
Low Voltage
21
Extra
44
Blower Speed
22
Flow Switch
45
Safety Input
23
Air Pressure
tN4
Errors
24
Option 1
46
Duplicate Master
25
Option 2
47
Device Error
26
Option 3
48
Device Lost
Error Codes
Register
Parameter
Read/Write
Format
Note
Register Address
Pump Control Mode
Parameters
MODBUS = TEMP or
RATE
System Pump
R/W
S16
1021
DHW Pump
R/W
S16
1022
Boiler Pump
R/W
S16
Only relevant when
"MODBUS = RATE"
1023
reserved
Temperature Control
Mode Parameters
MODBUS = TEMP
Target temperature
R/W
S16
50 to PIM™ value
1024
Auto Diff
R
S16
" 0 = off, 1 = on"
132
Manual
Differential
R/W
S16
2 to 42F (only
relevant when auto
diff is off)
1025
reserved
Rate Control Mode
Parameters
MODBUS = RATE
Target Mod
Rate
R/W
S16
0 - 100%
1026
R/W
S16
50 to 140F (not
available in initial
release)
1027
reserved
Summary of Contents for 5000.72A
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