Thermo Pride CLHS1-050P36N Installation And Operation Manual page 42

All installations and services must be performed by qualified service personnel.
If the sensed failure is in the system (external to the control), the LED will flash in the following flash-pause
sequences to indicate failure status (each flash will last approximately 0.25 seconds, and each pause will last
approximately 1 second).
CLHS1 (Single Stage Furnaces)
LED Off - No power to control, pushbutton switch pressed, or control fault
LED steady ON (Any color) - Control hardware fault detected
Slow Green flash - No call for heat, no active errors
Slow Orange flash - Call for heat present, no active errors
1 RED flash - High limit switch open
2 RED flashes - Pressure switch open with inducer on
3 RED flashes - Pressure switch closed with inducer off
4 RED flashes - 1 hour lockout code
5 RED flashes - Incorrect line voltage polarity or incorrect polarity on 24 VAC line from transformer
6 RED flashes – Too many limit trips in one call for heat
7 RED flashes – Pressure switch cycle lockout
8 RED flashes - Too many flame dropouts detected
9 RED flashes – Not Used
10 RED flashes – Flame present with gas valve off
Rapid flash – Incorrect 24 VAC phasing/twinning error
CLHX1 (Two Stage Furnaces)
LED Off - No power to control, pushbutton switch pressed, or control fault
LED steady ON (RED) - Control hardware fault detected
Slow GREEN flash - No call for heat, no active errors
Slow ORANGE flash - Call for heat present, no active errors
Fast ORANGE flash - Call for heat present, Low Flame Current (below 1.5uA)
1 RED flash - Flame present with gas valve off
2 RED flashes - Pressure switch closed with inducer off
3 RED flashes – 1st stage pressure switch open with inducer on
4 RED flashes – Limit/Rollout switch open
5 RED flashes – Limit/Rollout open more than 15 minutes
6 RED flashes - Pressure switch cycle lockout
7 RED flashes – 1-hour Lockout code
8 RED flashes - Lockout due to too many flame dropouts
9 RED flashes - Incorrect line voltage polarity or incorrect polarity on 24 VAC line from transformer
10 RED flashes – Gas valve fault code
11 RED flashes – Limit/Rollout switch open from 5 to 15 minutes
12 RED flashes – Opened/damaged HSI (not available on 1171-121 model)
13 RED flashes – 2nd stage pressure switch open with high speed inducer on
4 ORANGE flashes – Y thermostat demand without G thermostat demand
: Power must be disconnected before servicing.
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