NTI Trinity TX51 - Page 71

Tx I&O Manual │Display Menu Guide
71
Code
Description
Loc 2 - 4
Gas Valve Circuit Fault (Safety) – control has sensed a fault in the gas valve electrical circuit, check for a
loose connection in the gas valve wiring harness. Also see “Loc 5”.
Loc 5
Limit Circuit Open (Safety) – control has sensed a fault in the safety limit circuit; check the following:
1. External Limit (Purple wire) – if an external limit device (i.e. LWCO) is connected to the purple
wire at the field wiring terminal, check to ensure it has not tripped, and that it is wired correctly.
2. Internal Limit (Heat Exchanger Thermal Fuse) – the heat exchanger is equipped with a normally
closed thermal fuse; the fuse opens when the heat exchanger gets too hot. If the fuse is open,
contact NTI [see Figure 19-1(a), item 48].
Loc 6 & 7
Power Supply Electrical Interference – check for poor line, neutral and ground connections in the wiring
leading to the boiler. Check the internal ground connections within the boiler. Eliminate sources of
electrical noise, i.e. welders, large pump inverters, etc. If power is being supplied by a generator, install an
appropriately sized UPS (Uninterruptible Power Supply).
Loc 8-9
Controller Malfunction – contact NTI, check field wiring, replace controller.
Loc 10
Supply Sensor Fault – controller has sensed an invalid reading at the Supply/Outlet sensor; check cable,
then replace sensor [see Figure 19-1(a), item 15].
Loc 11
Uncorrected Blocking Error – a blocking error (Err) has lasted for 20 consecutive hours.
Loc 12
Incorrect Fan Speed – measured fan speed is not reaching target fan speed within 60 seconds. Check
wiring to fan, replace fan.
Loc 13-24
Controller Malfunction – contact NTI, check field wiring, replace controller.
Loc 25
Excessive Supply Temperature Reading – controller has sensed an excessive temperature reading at the
Supply/Outlet sensor; verify proper water circulation, check supply sensor cable, then replace sensor [see
Figure 19-1(a), item 15].
Loc 26
Flue Sensor Fault – controller has sensed an invalid reading at the Flue sensor; check cable, then replace
sensor [see Figure 19-1(a), item 20].
Loc 27
Flame present 10 seconds after closing gas valve – verify flame is going out immediately following the
end of a burner demand; check flame sensor (replace); check condensate drain for blockages; increase post
purge setting (Installer Menu setting 2-30).
Loc 28
Flame present before ignition – check flame sensor (replace); check condensate drain for blockages;
increase post purge setting (Installer Menu setting 2-30).
Loc 29-30
Controller Malfunction – contact NTI, check field wiring, replace controller.
Loc 31
Flame lost three times during one demand – see Loc 1.
Loc 32 up
Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 45-51
Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 52
Incorrect Field Wiring – check electrical connections to field terminal strip; ensure the Thermostat is
connected to terminals 7 and 8.
Err 53
Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 54
Flame detected out of sequence – check/replace flame sensor; check flame sensor wiring; check
condensate drain for blockages; replace controller.
Err 55-59
Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 60
Flue Sensor Error – flue temperature reading exceeds 220⁰F or the sensor is shorted, check flue sensor
connection and wiring. Temporarily disconnect the electrical connector from the flue sensor, if problem
goes away, replace flue sensor [see Figure 19-1(a), item 20]; if problem persists, replace the controller [see
Figure 19-1(d), item 61].
Err 61
Return Sensor Error – inlet temperature exceeded 203⁰F; error clears when inlet temperature drops below
190⁰F: (1) ensure there is water flow through the boiler, (2) check for correct return sensor reading (menu
reading 1-09), (3) check wiring to return sensor; replace sensor [see Figure 19-1(a), item 24].
Err 62-63
Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 64
Faulty Grounding – check appliance grounding to breaker panel, check internal ground connections.
Err 65
Incorrect Polarity – controller has sensed reversed polarity of the 120VAC power supply; check field
wiring to L2 NEUTRAL (terminals 12 &13) and L1 120VAC (terminal 14). There should be 120VAC
potential between L1 120VAC and ground, and 0VAC potential between L2 NEUTRAL and ground.