User Guide

84
Service Manual NeoTherm 80 - NeoTherm 285
Appendix 1 - Error Codes (continued)
Code Description L or H Procedure
53 AC input phases reversed L 1. Check the module and display connections.
2. Check the module power supply and make sure that
both frequency and voltage meet the specications.
3. On 24 VAC applications, assure that J4 terminal 10
and J8 terminal 2 are connected together.
59 Internal fault: Mux pin shorted L Internal fault.
1. Reset module.
2. If fault repeats, replace module.
61 Anti short cycle H Will not be a lockout fault. Hold only.
See Section A9.
62 Fan speed not proved H Will not be a lockout fault. Hold only.
It is normal to see this during startup only.
63 LCI (Limit Control Input) off
Problem with safety interlock chain
H 1. See Section A8 . Check wiring and correct any
faults. Check Interlocks connected to the LCI to assure
proper function.
2. Reset and sequence the module; monitor the LCI
status.
3. If code persists, replace the module
64 PII (Pre-Ignition Interlock) off H or L 1. Check wiring and correct any faults.
2. Check preignition interlock switches to assure proper
functioning.
3. Check the valve operation.
4. Reset and sequence the module; monitor the PII
status.
5. If code persists, replace the module.
67 ILK (Interlock) off H or L 1. Check wiring and correct any possible shorts.
2. Check Interlock (ILK) switches to assure proper func-
tion.
3. Verify voltage through the interlock string to the inter-
lock input with a voltmeter.
4. If steps 1-3 are correct and the fault persists, replace
the module.
68 ILK (Interlock) on H or L 1. Check wiring and correct any possible shorts.
2. Check Interlock (ILK) switches to assure proper func-
tion.
3. Verify voltage through the interlock string to the inter-
lock input with a voltmeter.
4. If steps 1-3 are correct and the fault persists, replace
the module.
70 Wait for leakage test completion H 1. Internal fault. Reset module.
2. If fault repeats, replace module.
78 Demand lost in run H 1. Check wiring and correct any possible errors.
2. If previous steps are correct and fault persists, re-
place the module.
Code Description L or H Procedure
79 Outlet high limit H or L 1. Check wiring and correct any possible errors. See
Section B7.
2. Replace the outlet high limit.
3. If previous steps are correct and fault persists, re-
place the module.
80 DHW (Domestic Hot Water) high limit H or L 1. Check wiring and correct any possible errors.
2. Replace the DHW high limit.
3. If previous steps are correct and fault persists, re-
place the module.
81 Delta T limit H or L 1. Check inlet and outlet sensors and pump circuits for
proper operation.
2. Recheck the Delta T Limit to conrm proper setting.
3. If previous steps are correct and fault persists, re-
place the module.
82 Stack limit H or L 1. See Section B20.
2. Check wiring and correct any possible errors.
3. Replace the stack high limit switch.
4. If previous steps are correct and fault persists, re-
place the module.
91 Inlet sensor fault H 1. Check wiring and correct any possible errors. See
Section B22.
2. Replace the Inlet sensor.
3. If previous steps are correct and fault persists, re-
place the module.
92 Outlet sensor fault H 1. Check wiring and correct any possible errors. See
Section B24.
2. Replace the outlet sensor.
3. If previous steps are correct and fault persists, re-
place the module.
93 DHW (Domestic Hot Water) sensor fault H 1. Check wiring and correct any possible errors. See
Section B26.
2. Replace the DHW sensor.
3. If previous steps are correct and fault persists, re-
place the module.
94 Header sensor fault H 1. Check wiring and correct any possible errors.
2. Replace the header sensor.
3. If previous steps are correct and fault persists, re-
place the module.
95 Stack sensor fault H 1. Check wiring and correct any possible errors. See
Section B20.
2. Replace the stack sensor.
3. If previous steps are correct and fault persists, re-
place the module.
96 Outdoor sensor fault H 1. Check wiring and correct any possible errors. See
Section B27.
2. Replace the outdoor sensor.
3. If previous steps are correct and fault persists, re-
place the module.
App1
cont.