Page No 32 Reznor, Guardian 1 Phase Electric Heat with Signal Pro, Installation Manual, EN 2021-11, D301375 Iss 0
FF
Signal Pro fault descriptions and remedies
Description
Symptom
Possible cause
Remedy
Communications
failure
No control on unit
Bad data cable
connection
Damaged cable
Check data cables
and plugs Replace
damaged cable
Air sensor failed
Fan operating, no
heat
Air sensor cable
disconnected
Air sensor broken
Check cable Replace
air sensor
Air sensor temp too
high
Fan operating, no
heat
High ambient
air temperature
Incorrect motor or
fan deck rotation
Motor failure
Check ventilation
Check rotation of
the fan deck
Check motor,
replace if necessary
Ext. temp sensor
failure
Unit runs but no
external temperature
control
External temperature
sensor faulty
Repair faulty wiring
Replace faulty sensor
Overheat stat open
circuit
Fan operating, no
heat
Overheat stat open
circuit
Replace overheat
thermostat
Table 10 Fault codes
Summary of Contents for GUARDIAN GB 1000
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