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Trouble shooting guide – Raypak 0180B User Manual

Page 31

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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)

1)When room thermostat is turned on,

boiler does not operate.

2)When room thermostat is calling for

heat, pump is on, but burners will not

turn on.

CAUSE(S)

1)No power to the boiler.

2)Defective room thermostat or discon-

nected wire in thermostat circuit.

3)Defective transformer.

4)Defective pump relay.

5)Defective pump

1)For Standing pilot models pilot burner

not lighted.

2)If pilot burner will not stay lighted,

thermocouple or gas valve may be

defective.

3)Gas knob in "Pilot" position.

4)For automatic ignition models,

gas valve knob is in "off" position.

5)Vent switch is open.

6)Roll-out switch is open.

7)High limit is open.

8) Fast Response Temperature

Sensor probe is defective.

9) Fast Response Temperature

sensor board is defective.

SOLUTION(S)

1)Check circuit breakers, disconnect

switch. Make sure power is on.

2)Check continuity on thermostat and

wiring circuit. Replace thermostat, or

repair wiring connections.

3) Check secondary voltage. If no 24V,

replace transformer.

4) Check relay coil or contacts. Replace

as required.

5) Replace pump.

1)Light pilot burner. (Follow lighting

instructions on rating plate).

2)Check thermocouple MV generation.

If less than 25MV (open circuit), re

place thermocouple. If between 25-

35 MV, replace gas valve.

3)Turn knob to "ON" position.

4)Turn gas knob to "ON". If ignition

module locks out, reset by interrupt-

ing power to boiler.

5) Check for blockage of venting system

or disconnected vent piping. After

problem is corrected push button to

reset, or replace single use type vent

switch.

6)Check for blockage of flue or sooted

heat exchanger. After problem is

corrected push button to reset or re-

place single use type roll-out switch.

7)Setting may be too low. Check water

flow and adjust setting to obtain 20-

30°F temperature rise.

8)Red LED on circuit board will be ON

to indicate a loose sensor connection

or a shorted sensor. Check terminal

connectors or replace sensor as re-

quired.

NOTE: Red LED will also be ON if

sensor temperature exceeds 300°F or

drops below - 20°F. It will turn OFF

when sensor temperature returns to the

proper range. Yellow LED will be ON, if

temperature exceeds 240°F. It will turn

off when sensor temperature falls below

180°F. When either Red or Yellow LED

is ON, boiler will be shut down.

9)Check voltage across output and

common terminals. If no 24V is pres-

ent, replace board.

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