Installation Guide

24
X. Troubleshooting
A. BEFORE TROUBLESHOOTING
The following pages contain troubleshooting tables for
use in diagnosing control problems. When using these
tables the following should be kept in mind:
1. This information is only meant to be used by
a professional heating technician as an aid in
diagnosing boiler problems.
2. In general, these tables assume that there are no
loose or miswired electrical connections. Before
using these tables inspect all electrical connections
on the boiler to make sure that they are tight. Also,
check the wiring on the boiler against the wiring
diagram in Figures 9 and 10. Ensure that incoming
120 Vac power polarity is correct and that the boiler
is properly grounded. Further, ensure that the control
power supply is 24 VAC (minimum 18 VAC to
maximum 30 VAC) and polarity is correct.
4. All controls on the RRG Series are tested at least
once in the manufacturing process and a defective
control or component is generally the least likely
cause. Before replacing a component, try to rule out
all other possible causes.
5. When checking voltage across wiring harness pins
be careful not to insert the meter probes into the
pins. Doing so may damage the pin, resulting in a
loose connection when the harness is reconnected.
Table 4: Troubleshooting Using the Control's LED
Flashing LED Fault Condition
POWER
Steady 1 Hz ash
Flash code 2
Flash code 3
Flash code 4
Flash code 5
Flash code 6
Reverse polarity of 115 VAC supply voltage
Faults internal to microprocessor (RAM, ROM, etc.)
Unused
Unused
Water thermistors disagree
Gas valve outputs in improper state
POWER + TSTAT/CIRC 48 volts on Thermostat circuit
DAMPER Damper switch opened after it had been proved closed. Continues ashing until demand for heat
removed or Damper switch proven closed in ignition sequence.
POWER + DAMPER Damper switch stuck open or closed (control in damper switch lockout)
LIMIT Fault detected in temperature sensing hardware
FLAME Flame loss, or ame not sensed during trial for ignition. Continues ashing until either ame is
established or demand for heat is removed.
POWER + FLAME Flame sensed without call for heat or out of sequence during ignition trial.
Lockouts
1. Lockout from internal hardware faults (listed above under POWER) automatically resets after the hardware fault has
not been present for 60 minutes. Lockouts from internal hardware faults may not be manually reset except by removing
power from the control.
2. Lockout from damper switch failing to close within 45 seconds automatically resets after 60 minutes. Lockout may be
manually reset by opening the thermostat for more than 2 but less then 20 seconds.