5. TROUBLE SHOOTING GUIDE
IMPORTANT NOTICE
These instructions are primarily intended for the use of qualified personnel specifically trained and experienced in the installation of this type of heating equipment and related system components. Installation and service personnel may be required by some states to be licensed. Persons not qualified shall not attempt to install this equipment nor attempt repairs according to these instructions.
PROBLEM(S) | CAUSE(S) | SOLUTION(S) |
1)When room thermostat is turned on, | 1)No power to the boiler. | 1)Check circuit breakers, disconnect |
boiler does not operate. |
| switch. Make sure power is on. |
| 2)Defective room thermostat or discon- | 2)Check continuity on thermostat and |
| wiring circuit. Replace thermostat, or | |
| nected wire in thermostat circuit. | |
| repair wiring connections. | |
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| |
| 3)Defective transformer. | 3) Check secondary voltage. If no 24V, |
| replace transformer. | |
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| |
| 4)Defective pump relay. | 4) Check relay coil or contacts. Replace |
| as required. | |
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| |
| 5)Defective pump | 5) Replace pump. |
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2)When room thermostat is calling for | 1)For Standing pilot models pilot burner | 1)Light pilot burner. (Follow lighting |
heat, pump is on, but burners will not | not lighted. | instructions on rating plate). |
turn on. | 2)If pilot burner will not stay lighted, | 2)Check thermocouple MV generation. |
| thermocouple or gas valve may be | If less than 25MV (open circuit), re |
| place thermocouple. If between 25- | |
| defective. | |
| 35 MV, replace gas valve. | |
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| |
| 3)Gas knob in "Pilot" position. | 3)Turn knob to "ON" position. |
| 4)Turn gas knob to "ON". If ignition | |
| 4)For automatic ignition models, | |
| module locks out, reset by interrupt- | |
| gas valve knob is in "off" position. | |
| ing power to boiler. | |
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| |
| 5)Vent switch is open. | 5) Check for blockage of venting system |
| or disconnected vent piping. After | |
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| |
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| problem is corrected push button to |
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| reset, or replace single use type vent |
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| switch. |
| 6)Check for blockage of flue or sooted | |
| heat exchanger. After problem is | |
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| |
|
| corrected push button to reset or re- |
|
| place single use type |
| 7)High limit is open. | 7)Setting may be too low. Check water |
| flow and adjust setting to obtain 20- | |
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| |
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| 30°F temperature rise. |
| 8) Fast Response Temperature | 8)Red LED on circuit board will be ON |
| to indicate a loose sensor connection | |
| Sensor probe is defective. | |
| or a shorted sensor. Check terminal | |
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| |
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| connectors or replace sensor as re- |
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| quired. |
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| NOTE: Red LED will also be ON if |
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| sensor temperature exceeds 300°F or |
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| drops below - 20°F. It will turn OFF |
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| when sensor temperature returns to the |
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| proper range. Yellow LED will be ON, if |
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| temperature exceeds 240°F. It will turn |
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| off when sensor temperature falls below |
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| 180°F. When either Red or Yellow LED |
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| is ON, boiler will be shut down. |
| 9) Fast Response Temperature | 9)Check voltage across output and |
| common terminals. If no 24V is pres- | |
| sensor board is defective. | |
| ent, replace board. | |
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