Use and Care Manual

41
110637-01 - 5/20
RRO Installation & Service Manual
System Condition Diagnostic Condition Check Action
Boiler is cold, house is
cold.
Display is OFF. 120 Vac System power. Turn system power on.
Display is ON. 24 Vac T-T No 24 V; replace control.
24 V present; disconnect
thermostat, short T-T.
Boiler starts, check wiring and
thermostat.
120 Vac at B1-B2 • If no, replace control.
• If yes, check burner and wiring.
Refer to Err on display. -----
Boiler is hot, house is
cold.
Display is ON. 120 Vac at C1-C2 • 120 Vac at C1-C2, check wiring
to pump.
• Wiring OK, is pump running?
• If not, replace the pump.
• If pump is running, check for
trapped air or closed zone valves
Boiler below the Low Limit
temperature, wait for boiler to go
above Low Limit temperature.
-----
Boiler above LL? If yes, check
for 120 Vac between ZC and L2.
• If no 120 Vac , replace control.
• If yes, check zone relays, circulators
and wiring.
Table 13-1: Troubleshooting Guide
Display Status Recommended Corrective Actions
Err 
Temperature Sensor Fault
Temperature sensor failure, wire harness loose or shorted connection or control
hardware failure:
- Check sensor is securely attached to boiler control
- Check that sensor wire is not damaged
- If secure and in good condition, replace sensor
- If problem persists, replace control
Err 2
Communication Fault
Enviracom terminal is shorted to ground or line voltage.
- Check wiring to EnviraCOM terminals 1,2 and 3. Wiring to external EnviraCom
device is incorrect.
Err 3
Internal Hardware Fault
Error detected with AC power supply frequency or boiler control failure. Cycle power
to the control. Replace control if problem persists.
Err 4
Burner Output (B1) Fault
B1 output sensed powered during safety output relay check sequence or un-powered
during running, or powered in idle in combination with water temperature above 264°F
limit. Cycle power to the control. Replace control if problem persists.
Err 5
Line Voltage Fault (< 80 Vac) AC voltage out of specification high or low; check L1, L2, 110 VAC.
Err 6
Fuse missing
Internal fuse is blown or missing. The fuse protects the Aquastat from miswiring the L1
and L2 on Oil Primary. When the Oil Primary is correctly wired the fuse is useless and
not detected. If Primary is wired incorrectly the fuse is blown out and Aquastat report
error 6. EnviraCOM message is sent when the wiring is fixed and the error disappears
to indicate the end of the error state. Check wiring and replace fuse.
Err 
User settings lost, (reset to
factory defaults)
Warning: Generated if user adjustments are lost and the device uses factory default
values. Error is cleared by entering and exiting the Adjustment mode. Replace control
if problem persists.
Err 
Manual Reset Lockout
(resettable)
Set if Err 4 was invoked four times in a row. Check wiring and clear Lockout by
pressing all three user keys for 30 seconds.
Table 13-2: Boiler control error numbers
13 Troubleshooting (continued)