Grindmaster 830, 815, 850 service manual Page American Metal Ware Hot Water Boiler

Page 9

American Metal Ware Hot Water Boiler

IV) Trouble Shooting Auto Refill, Low Water Cutoff, and Dual Level Control System (continued)

PROBLEM	POSSIBLE CAUSE		SERVICE CHECK	REMEDY
C) Auto refill fails to	3)	Water strainer clogged.	Water pressure before	Remove and clean micromesh screen
fill water tank			strainer and not after.	filter located in water strainer.
(continued).
	4)	No power on Dual	Check for 120V AC across	If voltage missing or incorrect,
		Level Control.	“H” and “N” terminals.	check wiring for looseness, breaks,
				and proper connections.
	5)	Fill solenoid valve	Disassemble.	Clean out and/or replace plunger
		clogged with scale		assembly or entire valve. May require
		or frozen closed.		new coil. Caution is advised to avoid
				damage to valve. See valve instruction
				sheet.
	6)	Fill solenoid valve	Jumper from “FILL”	Replace coil. Also check for frozen
		coil inoperative	terminal to “H” terminal	plunger. See valve instruction sheet.
			does not start fill.
	7)	Electrodes shorting to	Tank fills with electrode	Replace electrode assembly. If no
		ground.	wire disconnected from	remedy, check for improper wiring
			“HI” terminal.	(cut insulation) or electrode tips
				touching metal.
	8)	Dual Level Control	Tank does not fill	Replace Dual Level Control.
		faulty.	with electrode wire
			disconnected from “HI”
			terminal.
D) Auto Refill is erratic.	1)	Electrode shorting to	Tank fills with	Replace electrode assembly.
		ground completely or	electrode wire
		intermittently.	disconnected from “HI”
			terminal
	2)	Loose connection.	Visual. Check for “C” and	Push wire lead connector securely
			“HI” probe terminals as well	onto terminal(s). Replace connector
			as “FILL.” Also check	if wire is frayed or broken.
			neutral (white) wire at valve.
	3)	Dual Level Control	Tank does not fill with	Replace Dual Level Control.
		faulty.	electrode wires disconnected
			from “XL” and “H” terminals.