Raypak Boiler Troubleshooting and Epla Appliance Repair Guide

TROUBLESHOOTING

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 per- sonnel 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	CAUSES	SOLUTIONS
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.
	3)Defective transformer.	3) Check secondary voltage. If no 24V,
		replace transformer.
	4)Defective pump relay.	4) Check relay coil or contacts. Replace
		as required.
	5)Defective pump.	5) Replace pump.
2)When room thermostat is calling for	1)For standing pilot models, pilot	1)Light pilot burner. (Follow lighting
heat, pump is on, but burners will not	burner not lighted.	instructions on rating plate.)
		2)Check thermocouple MV generation.
turn on.	2)If pilot burner will not stay lighted,
	thermocouple or gas valve may be	If less than 25MV (open circuit), re-
		place thermocouple. If between 25-
	defective.
		35 MV, replace gas valve.
	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.
	5)Vent switch is open.	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)Roll-out switch is open.	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)High limit is open.	7)Setting may be too low. Check water
		flow and adjust setting to obtain 20-
		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
		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 Yel-
		low LED 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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